EP1537164A1 - Procede pour produire des membranes polymeres conductrices de protons, membranes polymeres perfectionnees et leur utilisation dans des piles a combustible - Google Patents
Procede pour produire des membranes polymeres conductrices de protons, membranes polymeres perfectionnees et leur utilisation dans des piles a combustibleInfo
- Publication number
- EP1537164A1 EP1537164A1 EP03794874A EP03794874A EP1537164A1 EP 1537164 A1 EP1537164 A1 EP 1537164A1 EP 03794874 A EP03794874 A EP 03794874A EP 03794874 A EP03794874 A EP 03794874A EP 1537164 A1 EP1537164 A1 EP 1537164A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- acid
- membrane
- acids
- aromatic
- compounds
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000012528 membrane Substances 0.000 title claims abstract description 109
- 238000000034 method Methods 0.000 title claims abstract description 41
- 229920005597 polymer membrane Polymers 0.000 title claims abstract description 16
- 239000002322 conducting polymer Substances 0.000 title claims abstract description 14
- 229920001940 conductive polymer Polymers 0.000 title claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 239000000446 fuel Substances 0.000 title claims description 9
- 230000007062 hydrolysis Effects 0.000 claims abstract description 59
- 238000006460 hydrolysis reaction Methods 0.000 claims abstract description 59
- 239000000203 mixture Substances 0.000 claims abstract description 30
- 150000001875 compounds Chemical class 0.000 claims abstract description 29
- 239000007788 liquid Substances 0.000 claims abstract description 28
- 229920000137 polyphosphoric acid Polymers 0.000 claims abstract description 24
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 9
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 9
- 239000011593 sulfur Substances 0.000 claims abstract description 9
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 239000011574 phosphorus Substances 0.000 claims abstract description 7
- 239000011261 inert gas Substances 0.000 claims abstract description 4
- -1 heteroaromatic carboxylic acids Chemical class 0.000 claims description 89
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 66
- 239000000178 monomer Substances 0.000 claims description 66
- 239000002253 acid Substances 0.000 claims description 53
- 125000003118 aryl group Chemical group 0.000 claims description 36
- 125000001072 heteroaryl group Chemical group 0.000 claims description 35
- ABLZXFCXXLZCGV-UHFFFAOYSA-N Phosphorous acid Chemical compound OP(O)=O ABLZXFCXXLZCGV-UHFFFAOYSA-N 0.000 claims description 33
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 32
- 229920000642 polymer Polymers 0.000 claims description 31
- 125000000542 sulfonic acid group Chemical group 0.000 claims description 25
- 230000015572 biosynthetic process Effects 0.000 claims description 16
- 238000004132 cross linking Methods 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 230000009471 action Effects 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 125000003837 (C1-C20) alkyl group Chemical group 0.000 claims description 8
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 claims description 8
- 150000008065 acid anhydrides Chemical class 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 8
- 150000007513 acids Chemical class 0.000 claims description 7
- 150000002926 oxygen Chemical class 0.000 claims description 7
- 239000001301 oxygen Substances 0.000 claims description 7
- 150000000000 tetracarboxylic acids Chemical class 0.000 claims description 7
- ARCGXLSVLAOJQL-UHFFFAOYSA-N trimellitic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C(C(O)=O)=C1 ARCGXLSVLAOJQL-UHFFFAOYSA-N 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- SCKXCAADGDQQCS-UHFFFAOYSA-N Performic acid Chemical compound OOC=O SCKXCAADGDQQCS-UHFFFAOYSA-N 0.000 claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- 150000001805 chlorine compounds Chemical class 0.000 claims description 6
- WJJMNDUMQPNECX-UHFFFAOYSA-N dipicolinic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=N1 WJJMNDUMQPNECX-UHFFFAOYSA-N 0.000 claims description 6
- 150000004820 halides Chemical class 0.000 claims description 6
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 claims description 6
- 150000003628 tricarboxylic acids Chemical class 0.000 claims description 6
- CDOWNLMZVKJRSC-UHFFFAOYSA-N 2-hydroxyterephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C(O)=C1 CDOWNLMZVKJRSC-UHFFFAOYSA-N 0.000 claims description 4
- BCEQKAQCUWUNML-UHFFFAOYSA-N 4-hydroxybenzene-1,3-dicarboxylic acid Chemical compound OC(=O)C1=CC=C(O)C(C(O)=O)=C1 BCEQKAQCUWUNML-UHFFFAOYSA-N 0.000 claims description 4
- QNVNLUSHGRBCLO-UHFFFAOYSA-N 5-hydroxybenzene-1,3-dicarboxylic acid Chemical compound OC(=O)C1=CC(O)=CC(C(O)=O)=C1 QNVNLUSHGRBCLO-UHFFFAOYSA-N 0.000 claims description 4
- 235000010290 biphenyl Nutrition 0.000 claims description 4
- LVPMIMZXDYBCDF-UHFFFAOYSA-N isocinchomeronic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)N=C1 LVPMIMZXDYBCDF-UHFFFAOYSA-N 0.000 claims description 4
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N phenylbenzene Natural products C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 claims description 4
- 230000000379 polymerizing effect Effects 0.000 claims description 4
- FOMVFKTYQSZBMJ-UHFFFAOYSA-N 1,5-dihydroxycyclohexa-3,5-diene-1,2-dicarboxylic acid Chemical compound OC(=O)C1C=CC(O)=CC1(O)C(O)=O FOMVFKTYQSZBMJ-UHFFFAOYSA-N 0.000 claims description 3
- UKGMFBZPIQCNPM-UHFFFAOYSA-N 1,6-dihydroxycyclohexa-3,5-diene-1,2-dicarboxylic acid Chemical compound OC(=O)C1C=CC=C(O)C1(O)C(O)=O UKGMFBZPIQCNPM-UHFFFAOYSA-N 0.000 claims description 3
- HSTOKWSFWGCZMH-UHFFFAOYSA-N 3,3'-diaminobenzidine Chemical group C1=C(N)C(N)=CC=C1C1=CC=C(N)C(N)=C1 HSTOKWSFWGCZMH-UHFFFAOYSA-N 0.000 claims description 3
- QXGJCWSBOZXWOV-UHFFFAOYSA-N 3,4-dihydroxyphthalic acid Chemical compound OC(=O)C1=CC=C(O)C(O)=C1C(O)=O QXGJCWSBOZXWOV-UHFFFAOYSA-N 0.000 claims description 3
- WAJQSFFBBJKSBB-UHFFFAOYSA-N 4,5-dihydroxynaphthalene-2,7-dicarboxylic acid Chemical compound OC1=CC(C(O)=O)=CC2=CC(C(=O)O)=CC(O)=C21 WAJQSFFBBJKSBB-UHFFFAOYSA-N 0.000 claims description 3
- LFEWXDOYPCWFHR-UHFFFAOYSA-N 4-(4-carboxybenzoyl)benzoic acid Chemical compound C1=CC(C(=O)O)=CC=C1C(=O)C1=CC=C(C(O)=O)C=C1 LFEWXDOYPCWFHR-UHFFFAOYSA-N 0.000 claims description 3
- WVDRSXGPQWNUBN-UHFFFAOYSA-N 4-(4-carboxyphenoxy)benzoic acid Chemical compound C1=CC(C(=O)O)=CC=C1OC1=CC=C(C(O)=O)C=C1 WVDRSXGPQWNUBN-UHFFFAOYSA-N 0.000 claims description 3
- NEQFBGHQPUXOFH-UHFFFAOYSA-N 4-(4-carboxyphenyl)benzoic acid Chemical compound C1=CC(C(=O)O)=CC=C1C1=CC=C(C(O)=O)C=C1 NEQFBGHQPUXOFH-UHFFFAOYSA-N 0.000 claims description 3
- VNLYHYHJIXGBFX-UHFFFAOYSA-N 4-(trifluoromethyl)phthalic acid Chemical compound OC(=O)C1=CC=C(C(F)(F)F)C=C1C(O)=O VNLYHYHJIXGBFX-UHFFFAOYSA-N 0.000 claims description 3
- XFFZVIRSYFJKEX-UHFFFAOYSA-N 4-phenylpyridine-2,5-dicarboxylic acid Chemical compound C1=NC(C(=O)O)=CC(C=2C=CC=CC=2)=C1C(O)=O XFFZVIRSYFJKEX-UHFFFAOYSA-N 0.000 claims description 3
- 230000000712 assembly Effects 0.000 claims description 3
- 238000000429 assembly Methods 0.000 claims description 3
- ANUAIBBBDSEVKN-UHFFFAOYSA-N benzene-1,2,4,5-tetramine Chemical compound NC1=CC(N)=C(N)C=C1N ANUAIBBBDSEVKN-UHFFFAOYSA-N 0.000 claims description 3
- 239000004305 biphenyl Substances 0.000 claims description 3
- MPFLRYZEEAQMLQ-UHFFFAOYSA-N dinicotinic acid Chemical compound OC(=O)C1=CN=CC(C(O)=O)=C1 MPFLRYZEEAQMLQ-UHFFFAOYSA-N 0.000 claims description 3
- MJIVRKPEXXHNJT-UHFFFAOYSA-N lutidinic acid Chemical compound OC(=O)C1=CC=NC(C(O)=O)=C1 MJIVRKPEXXHNJT-UHFFFAOYSA-N 0.000 claims description 3
- ABMFBCRYHDZLRD-UHFFFAOYSA-N naphthalene-1,4-dicarboxylic acid Chemical compound C1=CC=C2C(C(=O)O)=CC=C(C(O)=O)C2=C1 ABMFBCRYHDZLRD-UHFFFAOYSA-N 0.000 claims description 3
- DFFZOPXDTCDZDP-UHFFFAOYSA-N naphthalene-1,5-dicarboxylic acid Chemical compound C1=CC=C2C(C(=O)O)=CC=CC2=C1C(O)=O DFFZOPXDTCDZDP-UHFFFAOYSA-N 0.000 claims description 3
- RXOHFPCZGPKIRD-UHFFFAOYSA-N naphthalene-2,6-dicarboxylic acid Chemical compound C1=C(C(O)=O)C=CC2=CC(C(=O)O)=CC=C21 RXOHFPCZGPKIRD-UHFFFAOYSA-N 0.000 claims description 3
- GMIOYJQLNFNGPR-UHFFFAOYSA-N pyrazine-2,5-dicarboxylic acid Chemical compound OC(=O)C1=CN=C(C(O)=O)C=N1 GMIOYJQLNFNGPR-UHFFFAOYSA-N 0.000 claims description 3
- IAYUQKZZQKUOFL-UHFFFAOYSA-N pyridine-2,3,5,6-tetramine Chemical compound NC1=CC(N)=C(N)N=C1N IAYUQKZZQKUOFL-UHFFFAOYSA-N 0.000 claims description 3
- HLRLQGYRJSKVNX-UHFFFAOYSA-N pyrimidine-2,4-dicarboxylic acid Chemical compound OC(=O)C1=CC=NC(C(O)=O)=N1 HLRLQGYRJSKVNX-UHFFFAOYSA-N 0.000 claims description 3
- PIPQOFRJDBZPFR-UHFFFAOYSA-N 1h-benzimidazole-5,6-dicarboxylic acid Chemical compound C1=C(C(O)=O)C(C(=O)O)=CC2=C1NC=N2 PIPQOFRJDBZPFR-UHFFFAOYSA-N 0.000 claims description 2
- YDMVPJZBYSWOOP-UHFFFAOYSA-N 1h-pyrazole-3,5-dicarboxylic acid Chemical compound OC(=O)C=1C=C(C(O)=O)NN=1 YDMVPJZBYSWOOP-UHFFFAOYSA-N 0.000 claims description 2
- KKTUQAYCCLMNOA-UHFFFAOYSA-N 2,3-diaminobenzoic acid Chemical compound NC1=CC=CC(C(O)=O)=C1N KKTUQAYCCLMNOA-UHFFFAOYSA-N 0.000 claims description 2
- PGRIMKUYGUHAKH-UHFFFAOYSA-N 2,4,5,6-tetrafluorobenzene-1,3-dicarboxylic acid Chemical compound OC(=O)C1=C(F)C(F)=C(F)C(C(O)=O)=C1F PGRIMKUYGUHAKH-UHFFFAOYSA-N 0.000 claims description 2
- YJLVXRPNNDKMMO-UHFFFAOYSA-N 3,4,5,6-tetrafluorophthalic acid Chemical compound OC(=O)C1=C(F)C(F)=C(F)C(F)=C1C(O)=O YJLVXRPNNDKMMO-UHFFFAOYSA-N 0.000 claims description 2
- GWHLJVMSZRKEAQ-UHFFFAOYSA-N 3-(2,3-dicarboxyphenyl)phthalic acid Chemical compound OC(=O)C1=CC=CC(C=2C(=C(C(O)=O)C=CC=2)C(O)=O)=C1C(O)=O GWHLJVMSZRKEAQ-UHFFFAOYSA-N 0.000 claims description 2
- BBCQSMSCEJBIRD-UHFFFAOYSA-N 3-fluorophthalic acid Chemical compound OC(=O)C1=CC=CC(F)=C1C(O)=O BBCQSMSCEJBIRD-UHFFFAOYSA-N 0.000 claims description 2
- UITKHKNFVCYWNG-UHFFFAOYSA-N 4-(3,4-dicarboxybenzoyl)phthalic acid Chemical compound C1=C(C(O)=O)C(C(=O)O)=CC=C1C(=O)C1=CC=C(C(O)=O)C(C(O)=O)=C1 UITKHKNFVCYWNG-UHFFFAOYSA-N 0.000 claims description 2
- LFBALUPVVFCEPA-UHFFFAOYSA-N 4-(3,4-dicarboxyphenyl)phthalic acid Chemical compound C1=C(C(O)=O)C(C(=O)O)=CC=C1C1=CC=C(C(O)=O)C(C(O)=O)=C1 LFBALUPVVFCEPA-UHFFFAOYSA-N 0.000 claims description 2
- SBBQDUFLZGOASY-OWOJBTEDSA-N 4-[(e)-2-(4-carboxyphenyl)ethenyl]benzoic acid Chemical compound C1=CC(C(=O)O)=CC=C1\C=C\C1=CC=C(C(O)=O)C=C1 SBBQDUFLZGOASY-OWOJBTEDSA-N 0.000 claims description 2
- PHQYMDAUTAXXFZ-UHFFFAOYSA-N 4-[2-(4-carboxyphenyl)-1,1,1,3,3,3-hexafluoropropan-2-yl]benzoic acid Chemical compound C1=CC(C(=O)O)=CC=C1C(C(F)(F)F)(C(F)(F)F)C1=CC=C(C(O)=O)C=C1 PHQYMDAUTAXXFZ-UHFFFAOYSA-N 0.000 claims description 2
- HAEJSGLKJYIYTB-ZZXKWVIFSA-N 4-carboxycinnamic acid Chemical compound OC(=O)\C=C\C1=CC=C(C(O)=O)C=C1 HAEJSGLKJYIYTB-ZZXKWVIFSA-N 0.000 claims description 2
- QURGMSIQFRADOZ-UHFFFAOYSA-N 5-(3,5-dicarboxyphenyl)benzene-1,3-dicarboxylic acid Chemical class OC(=O)C1=CC(C(O)=O)=CC(C=2C=C(C=C(C=2)C(O)=O)C(O)=O)=C1 QURGMSIQFRADOZ-UHFFFAOYSA-N 0.000 claims description 2
- MMHLSHSAOIJBHI-UHFFFAOYSA-N 5-(3-carboxyphenyl)benzene-1,3-dicarboxylic acid Chemical compound OC(=O)C1=CC=CC(C=2C=C(C=C(C=2)C(O)=O)C(O)=O)=C1 MMHLSHSAOIJBHI-UHFFFAOYSA-N 0.000 claims description 2
- KBZFDRWPMZESDI-UHFFFAOYSA-N 5-aminobenzene-1,3-dicarboxylic acid Chemical compound NC1=CC(C(O)=O)=CC(C(O)=O)=C1 KBZFDRWPMZESDI-UHFFFAOYSA-N 0.000 claims description 2
- AUIOTTUHAZONIC-UHFFFAOYSA-N 5-fluorobenzene-1,3-dicarboxylic acid Chemical compound OC(=O)C1=CC(F)=CC(C(O)=O)=C1 AUIOTTUHAZONIC-UHFFFAOYSA-N 0.000 claims description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 2
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 claims description 2
- KCTSXBFNNAXQFG-UHFFFAOYSA-N [hydroxy(oxido)phosphaniumyl]phosphinic acid Chemical compound OP(=O)P(O)=O KCTSXBFNNAXQFG-UHFFFAOYSA-N 0.000 claims description 2
- ZOQOMVWXXWHKGT-UHFFFAOYSA-N benzene-1,3,5-tricarboxylic acid Chemical compound OC(=O)C1=CC(C(O)=O)=CC(C(O)=O)=C1.OC(=O)C1=CC(C(O)=O)=CC(C(O)=O)=C1 ZOQOMVWXXWHKGT-UHFFFAOYSA-N 0.000 claims description 2
- 125000006267 biphenyl group Chemical group 0.000 claims description 2
- NEQVFHFOWYYPBS-UHFFFAOYSA-M dimethyl(3-triphenylphosphaniumylpropyl)azanium;dibromide Chemical compound Br.[Br-].C=1C=CC=CC=1[P+](C=1C=CC=CC=1)(CCCN(C)C)C1=CC=CC=C1 NEQVFHFOWYYPBS-UHFFFAOYSA-M 0.000 claims description 2
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- 239000000155 melt Substances 0.000 claims description 2
- OBKARQMATMRWQZ-UHFFFAOYSA-N naphthalene-1,2,5,6-tetracarboxylic acid Chemical compound OC(=O)C1=C(C(O)=O)C=CC2=C(C(O)=O)C(C(=O)O)=CC=C21 OBKARQMATMRWQZ-UHFFFAOYSA-N 0.000 claims description 2
- OLAPPGSPBNVTRF-UHFFFAOYSA-N naphthalene-1,4,5,8-tetracarboxylic acid Chemical compound C1=CC(C(O)=O)=C2C(C(=O)O)=CC=C(C(O)=O)C2=C1C(O)=O OLAPPGSPBNVTRF-UHFFFAOYSA-N 0.000 claims description 2
- ACVYVLVWPXVTIT-UHFFFAOYSA-N phosphinic acid Chemical compound O[PH2]=O ACVYVLVWPXVTIT-UHFFFAOYSA-N 0.000 claims description 2
- 125000004437 phosphorous atom Chemical group 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims description 2
- CHGYKYXGIWNSCD-UHFFFAOYSA-N pyridine-2,4,6-tricarboxylic acid Chemical compound OC(=O)C1=CC(C(O)=O)=NC(C(O)=O)=C1 CHGYKYXGIWNSCD-UHFFFAOYSA-N 0.000 claims description 2
- CYIDZMCFTVVTJO-UHFFFAOYSA-N pyromellitic acid Chemical class OC(=O)C1=CC(C(O)=O)=C(C(O)=O)C=C1C(O)=O CYIDZMCFTVVTJO-UHFFFAOYSA-N 0.000 claims description 2
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- 229910052739 hydrogen Inorganic materials 0.000 description 22
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- 239000000945 filler Substances 0.000 description 4
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- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 4
- 229910000510 noble metal Inorganic materials 0.000 description 4
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- 229920000139 polyethylene terephthalate Polymers 0.000 description 4
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- 125000003277 amino group Chemical group 0.000 description 3
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- WYKYCHHWIJXDAO-UHFFFAOYSA-N tert-butyl 2-ethylhexaneperoxoate Chemical compound CCCCC(CC)C(=O)OOC(C)(C)C WYKYCHHWIJXDAO-UHFFFAOYSA-N 0.000 description 1
- PFBLRDXPNUJYJM-UHFFFAOYSA-N tert-butyl 2-methylpropaneperoxoate Chemical compound CC(C)C(=O)OOC(C)(C)C PFBLRDXPNUJYJM-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
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- C08J5/20—Manufacture of shaped structures of ion-exchange resins
- C08J5/22—Films, membranes or diaphragms
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- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
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- C08G73/0605—Polycondensates containing five-membered rings, not condensed with other rings, with nitrogen atoms as the only ring hetero atoms
- C08G73/0616—Polycondensates containing five-membered rings, not condensed with other rings, with nitrogen atoms as the only ring hetero atoms with only two nitrogen atoms in the ring
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C08G73/0622—Polycondensates containing six-membered rings, not condensed with other rings, with nitrogen atoms as the only ring hetero atoms
- C08G73/0627—Polycondensates containing six-membered rings, not condensed with other rings, with nitrogen atoms as the only ring hetero atoms with only one nitrogen atom in the ring
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- C08G73/0622—Polycondensates containing six-membered rings, not condensed with other rings, with nitrogen atoms as the only ring hetero atoms
- C08G73/0633—Polycondensates containing six-membered rings, not condensed with other rings, with nitrogen atoms as the only ring hetero atoms with only two nitrogen atoms in the ring
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- C08G73/0688—Polycondensates containing six-membered rings, condensed with other rings, with nitrogen atoms as the only ring hetero atoms with only one nitrogen atom in the ring, e.g. polyquinolines
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/18—Polybenzimidazoles
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L79/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen or carbon only, not provided for in groups C08L61/00 - C08L77/00
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- C08L79/06—Polyhydrazides; Polytriazoles; Polyamino-triazoles; Polyoxadiazoles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Definitions
- the present invention relates to processes for the production of proton-conducting polymer membranes and improved polymer membranes which, owing to their outstanding chemical and thermal properties, can be used in a variety of ways and are particularly suitable as a polymer electrolyte membrane (PEM) in so-called PEM fuel cells.
- PEM polymer electrolyte membrane
- Proton-conducting polymer membranes with good properties are known.
- the publications DE No. 10117686.4 and DE No. 10117687.2 describe membranes which have a high phosphoric acid content. These membranes are obtained by solidifying a soft layer containing polyphosphoric acid into a membrane comprising phosphoric acid. The solidification is achieved by the hydrolysis of polyphosphoric acid to phosphoric acid.
- hydrolysis can be accomplished by atmospheric humidity.
- the disadvantage here is that the moisture content can fluctuate. As a result, the hydrolysis proceeds unevenly, as a result of which no consistent product quality can be achieved. If the air humidity is very low, phase separation can occur.
- the hydrolysis can also take place under air-conditioned conditions. However, it is problematic that the hydrolysis proceeds very slowly in order to achieve a high acidity. It should be borne in mind that a climate chamber is quite expensive.
- the hydrolysis starts on one side from a surface, the hydrolysis starting selectively.
- the present invention is therefore based on the object of providing methods for producing polymer electrolyte membranes which achieve the objects set out above.
- the method should enable inexpensive production of polymer electrolyte membranes with high, constant product quality.
- the membranes should have a high performance, in particular a high conductivity over a wide temperature range.
- the present invention accordingly relates to a proton-conducting polymer membrane comprising polyazole blends obtainable by a process comprising the steps
- step B) preparation of a mixture comprising polyphosphoric acid, at least one polyazole and / or at least one or more compounds which are suitable for the formation of polyazoles under the action of heat in accordance with step B),
- step B) heating the mixture obtainable according to step A) under inert gas to temperatures up to 400 ° C.
- step C) applying a layer using the mixture according to step A) and / or B) on a support
- step C Treatment of the membrane formed in step C), characterized in that the membrane is treated with a hydrolysis liquid which comprises oxygen acids of phosphorus and / or oxygen acids of sulfur.
- the membrane can be passed directly into a hydrolysis liquid which has, for example, a predetermined concentration of phosphoric acid.
- a hydrolysis liquid which has, for example, a predetermined concentration of phosphoric acid.
- the hydrolysis time of the membrane can also be significantly reduced by increasing the temperature.
- the method according to the invention in particular enables membranes to be obtained which have a high mechanical stability at a very high acid concentration.
- the membranes obtained by the present process can be stored for a relatively long time particularly simply by welding in an acid-stable film, for example a polyethylene or polypropylene film.
- a membrane according to the invention exhibits a high conductivity over a wide temperature range, which is also achieved without additional moistening.
- a membrane according to the invention has a relatively high mechanical stability.
- the composition produced according to step B) comprises polyazoles. These polymers can already be added in step A). Furthermore, these polymers can also be obtained from the monomers, oligomers and / or prepolymers on which the polymer is based during the heating according to step B).
- Polymers based on polyazole contain recurring azole units of the general formula (I) and / or (II) and / or (III) and / or (IV) and / or (V) and / or (VI) and / or (VII) and / or (VIII) and / or (IX) and / or (X) and / or (XI) and / or (XIII) and / or (XIV) and / or (XV) and / or (XVI) and / or (XVI) and / or (XVII) and / or (XVIII) and / or (XIX) and / or (XX) and / or (XXI) and / or (XVIII) and / or (XIX) and / or (XX) and / or (XXI) and / or (XVIII) and / or (XIX) and / or (XX) and / or (XXI) and /
- Ar are the same or different and for a tetra-bonded aromatic or heteroaromatic group, which can be mono- or polynuclear
- Ar 1 are the same or different and for a divalent aromatic or heteroaromatic group, which can be mono- or polynuclear
- Ar 2 are the same or different
- Ar 3 are the same or different for a two or three-membered aromatic or heteroaromatic group, which may be mono- or polynuclear, and for a tridentic aromatic or heteroaromatic group, which may be single or polynuclear
- Ar 4 are the same or different and for a three-membered aromatic or heteroaromatic group which may be mono- or polynuclear
- Ar 5 are the same or different and for a tetra-aromatic or heteroaromatic group which may be mono- or polynuclear
- Ar 6 are the same or different and for a divalent aromatic or heteroaromatic group, which can be mononuclear or polynuclear
- Amino group which has a hydrogen atom, a group having 1-20 carbon atoms, preferably a branched or unbranched
- Alkyl or alkoxy group, or an aryl group as further radical R carries the same or different for hydrogen, an alkyl group and an aromatic
- R in formula XX is a divalent group and n, m is an integer greater than or equal to 10, preferably greater than or equal to 100.
- Aromatic or heteroaromatic groups preferred according to the invention are derived from benzene, naphthalene, biphenyl, diphenyl ether, diphenylmethane, diphenyldimethylmethane, bisphenone, diphenylsulfone, thiophene, furan, pyrrole, thiazole, oxazole, imidazole, isothiazole, isoxazole-pyrazole, pyrazole , 2.5- Diphenyl-1, 3,4-oxadiazole, 1, 3,4-thiadiazole, 1, 3,4-triazole, 2,5-diphenyl-1,3,4-triazole, 1, 2,5-triphenyl-1, 3,4-triazole, 1, 2,4-oxadiazole, 1, 2,4-thiadiazole,
- the substitution pattern of Ar 1 , Ar 4 , Ar 6 , Ar 7 , Ar 8 , Ar 9 , Ar 10 , Ar 11 is arbitrary, in the case of phenylene, for example, Ar 1 , Ar 4 , Ar 6 , Ar 7 , Ar 8 , Ar 9 , Ar 10 , Ar 11 are ortho-, meta- and para-phenyien. Particularly preferred groups derive from benzene and biphenyls, which may also be substituted.
- Preferred alkyl groups are short-chain alkyl groups with 1 to 4 carbon atoms, such as. B. methyl, ethyl, n- or i-propyl and t-butyl groups.
- Preferred aromatic groups are phenyl or naphthyl groups.
- the alkyl groups and the aromatic groups can be substituted.
- Preferred substituents are halogen atoms such as. B. fluorine, amino groups, hydroxyl groups or short-chain alkyl groups such as. B. methyl or ethyl groups.
- the polyazoles can also have different recurring units which differ, for example, in their X radical. However, it preferably has only the same X radicals in a recurring unit.
- polyazole polymers are polyimidazoles, polybenzimidazole ether ketone, polybenzothiazoles, polybenzoxazoles, polyoxadiazoles, Polyquinoxalines, polythiadiazoles poly (pyridines), poly (pyrimidines), and poly (tetrazapyrenes).
- the polymer containing recurring azole units is a copolymer or a blend which contains at least two units of the formulas (I) to (XXII) which differ from one another.
- the polymers can be present as block copolymers (diblock, triblock), statistical copolymers, periodic copolymers and / or alternating polymers.
- the polymer containing recurring azole units is a polyazole which contains only units of the formula (I) and / or (II).
- the number of repeating azole units in the polymer is preferably an integer greater than or equal to 10.
- Particularly preferred polymers contain at least 100 repeating azole units.
- polymers containing recurring benzimidazole units are preferred.
- Some examples of the extremely useful polymers containing recurring benzimidazole units are represented by the following formulas:
- n and m is an integer greater than or equal to 10, preferably greater than or equal to 100.
- the polyazoles used in step A), but especially the polybenzimidazoles, are distinguished by a high molecular weight. Measured as intrinsic viscosity, this is preferably in the range from 0.3 to 10 dl / g, in particular 1 to 5 dl / g.
- the polyazoles can also be prepared in step B) by heating. For this purpose, one or more compounds can be added to the mixture in step A) which are suitable for the formation of polyazoles under the action of heat in step B).
- Mixtures are suitable for this purpose which comprise one or more aromatic and / or heteroaromatic tetra-amino compounds and one or more aromatic and / or heteroaromatic carboxylic acids or their derivatives which comprise at least two acid groups per carboxylic acid monomer. Furthermore, one or more aromatic and / or heteroaromatic diaminocarboxylic acids can be used for the production of polyazoles.
- the aromatic and heteroaromatic tetra-amino compounds include, inter alia, 3,3 ', 4,4'-tetraaminobiphenyl, 2,3,5,6-tetraaminopyridine, 1, 2,4,5-tetraaminobenzene, 3,3', 4,4'-tetraaminodiphenyl sulfone, 3,3 ', 4,4'-tetraaminodiphenyl ether, 3,3', 4,4'-tetraaminobenzophenone, 3,3 ', 4,4'-tetraaminodiphenylmethane and 3,3', 4, 4'-tetraaminodiphenyldimethylmethane and their salts, in particular their mono-, di-, tri- and tetrahydrochloride derivatives.
- Mixture A) may further comprise aromatic and / or heteroaromatic carboxylic acids.
- aromatic and / or heteroaromatic carboxylic acids are dicarboxylic acids and tricarboxylic acids and tetracarboxylic acids or their esters or their anhydrides or their acid halides, in particular their acid halides and / or acid bromides.
- the aromatic dicarboxylic acids are preferably isophthalic acid, terephthalic acid, phthalic acid, 5-hydroxyisophthalic acid, 4-hydroxyisophthalic acid, 2-hydroxyterephthalic acid, 5-aminoisophthalic acid, 5-N, N-dimethylaminoisophthalic acid, 5-N, N-diethylaminoisinoamino - Dihydroxy terephthalic acid, 2,6-dihydroxyisophthalic acid, 4,6-dihydroxyisophthalic acid, 2,3-dihydroxyphthalic acid, 2,4-dihydroxyphthalic acid.
- Aryl esters or their acid anhydrides or their acid chlorides are preferably 1,3,5-benzene-tricarboxylic acid (Trimesic acid), 1,2,4-benzene-tricarboxylic acid (Trimellitic acid),
- aromatic tetracarboxylic acids or their C1-C20 alkyl esters or C5-C12 aryl esters or their acid anhydrides or their acid chlorides are preferably 3,5,3 ', 5'-biphenyltetracarboxylic acid, 1, 2.4 , 5-benzenetetracarboxylic acid, benzophenonetetracarboxylic acid, 3,3 ', 4,4'-biphenyltetracarboxylic acid, 2, 2', 3,3'-biphenyltetracarboxylic acid, 1, 2,5,6-naphthalenetetracarboxylic acid, 1, 4,5,8-naphthalenetetracarboxylic acid ,
- heteroaromatic carboxylic acids are heteroaromatic dicarboxylic acids and tricarboxylic acids and tetracarboxylic acids or their esters or their anhydrides.
- Heteroaromatic carboxylic acids are understood to mean aromatic systems which contain at least one nitrogen, oxygen, sulfur or phosphorus atom in the aromatic system.
- pyridine-2,5-dicarboxylic acid pyridine-3,5-dicarboxylic acid, pyridine-2,6-dicarboxylic acid, pyridine-2,4-dicarboxylic acid, 4-phenyl-2,5-pyridinedicarboxylic acid, 3.5 -PyrazoIdicarboxylic acid, 2,6 - Pyrimidinedicarboxylic acid, 2,5-Pyrazinedicarboxylic acid, 2,4,6-Pyridinetricarboxylic acid, Benzimidazole-5,6-dicarboxylic acid.
- C1-C20 alkyl esters or C5-C12 aryl esters or their acid anhydrides or their acid chlorides.
- the content of tricarboxylic acid or tetracarboxylic acids is between 0 and 30 mol%, preferably 0.1 and 20 mol%, in particular 0.5 and 10 mol%.
- Mixture A can also contain aromatic and heteroaromatic diaminocarboxylic acids. These include diaminobenzoic acid, 4-phenoxycarbonyl-3, '4'-diaminodiphenyl ether and their mono- and dihydrochloride derivatives.
- Mixtures of at least 2 different aromatic carboxylic acids are preferred in step A). Mixtures are particularly preferred used, which contain not only aromatic carboxylic acids but also heteroaromatic carboxylic acids.
- the mixing ratio of aromatic carboxylic acids to heteroaromatic carboxylic acids is between 1:99 and 99: 1, preferably 1:50 to 50: 1.
- mixtures are in particular mixtures of N-heteroaromatic dicarboxylic acids and aromatic dicarboxylic acids.
- dicarboxylic acids are isophthalic acid, terephthalic acid, phthalic acid, 2,5-dihydroxyterephthalic acid, 2,6-dihydroxyisophthalic acid, 4,6-dihydroxyisophthalic acid, 2,3-dihydroxyphthalic acid, 2,4-dihydroxyphthalic acid.
- the molar ratio of carboxylic acid groups to amino groups in the reaction of tetraamino compounds with one or more aromatic carboxylic acids or their esters, which contain at least two acid groups per carboxylic acid monomer is preferably close of 1: 2.
- the mixture produced in step A) preferably comprises at least 0.5% by weight, in particular 1 to 30% by weight and particularly preferably 2 to 15% by weight, of monomers for the production of polyazoles.
- step A) also contains tricarboxylic acids or tetracarboxylic acid, branching / crosslinking of the polymer formed is achieved in this way. This contributes to the improvement of the mechanical property.
- the mixture prepared in step A) comprises compounds which, under the action of heat in step B), are suitable for the formation of polyazoles, these compounds by reaction of one or more aromatic and / or heteroaromatic tetraamino -Compounds with one or more aromatic and / or heteroaromatic carboxylic acids or their derivatives, which contain at least two acid groups per carboxylic acid monomer, or of one or more aromatic and / or heteroaromatic diaminocarboxylic acids in the melt at temperatures of up to 400 ° C, in particular up to 350 ° C, preferably up to 280 ° C are available.
- the compounds to be used to prepare these prepolymers have been set out above.
- the polyphosphoric acid used in step A) is a commercially available polyphosphoric acid such as is available, for example, from Riedel-de Haen.
- the polyphosphoric acids H n + 2 PnO 3n + ⁇ (n> 1) usually have a content calculated as P 2 Os (acidimeth) of at least 83%.
- a dispersion / suspension can also be produced.
- At least one further polymer which is not a polyazole can be added to the composition produced in step A) and / or step B) (polymer (B)).
- This polymer can be dissolved, dispersed or suspended, among other things.
- the weight ratio of polyazole to polymer (B) can be in particular in the range from 0.1 to 50, preferably from 0.2 to 20, particularly preferably from 1 to 10. If the polyazole is only formed in step B), the weight ratio can be calculated from the weight of the monomers to form the polyazole, the compounds released during the condensation, for example water, having to be taken into account.
- the preferred polymers include polyolefins, such as poly (chloroprene), polyacetylene, polyphenylene, poly (p-xylylene), polyarylmethylene, polyarmethylene, polystyrene, polymethylstyrene, polyvinyl alcohol, polyvinyl acetate, polyvinyl ether, polyvinylamine, poly (N-vinyl acetamide), polyvinyl imidazole , polyvinylcarbazole, polyvinylpyrrolidone, polyvinylpyridine, polyvinyl chloride, polyvinylidene chloride, polytetrafluoroethylene, polyhexafluoropropylene, copolymers of PTFE with hexafluoropropylene, perfluoropropyl vinyl ether with with Trifluoronitrosomethan with Sulfonylfluoridvinylether, perfluoroalkoxy vinyl ethers with carbalkoxy, polychloro
- Polyhydroxybenzoate polyhydroxypropionic acid, polypivalolactone, polycaprolactone,
- Polymeric C-S bonds in the main chain for example polysulfide ether,
- Polyimines polyisocyanides, polyetherimine, polyaniline, polyamides, polyhydrazides,
- Polyurethanes polyimides, polyazoles, polyazines
- Liquid crystalline polymers especially Vectra as well
- Inorganic polymers for example polysilanes, polycarbosilanes, polysiloxanes,
- Polysilicic acid Polysilicates, silicones, polyphosphazenes and polythiazyl.
- step B) the mixture obtained in step A) is heated to a temperature of up to 400 ° C., in particular up to 350 ° C., preferably up to 280 ° C., in particular 100 ° C. to 250 ° C. and particularly preferably in the range from 180 ° C to 250 ° C heated.
- An inert gas for example nitrogen or a noble gas, such as neon, argon, is used here.
- this step either serves to dissolve or disperse the polyazoles, or to form polyazoles from monomers or polymeric precursors of the poiyazoie.
- the heating according to step B) can take place after the formation of a flat structure according to step C).
- the mixture produced in step A) and / or step B) may additionally contain organic solvents. These can have a positive impact on processability. For example, the rheology of the solution can be improved so that it can be extruded or squeegee more easily.
- fillers in particular proton-conducting fillers, and additional acids can also be added to the membrane.
- the addition can take place, for example, in step A), step B) and / or step C).
- these additives if they are in liquid form, can also be added after the polymerization in step D).
- these additives can be added to the hydrolysis liquid.
- Non-limiting examples of proton-conducting fillers are sulfates such as: CsHSO 4 , Fe (SO 4 ) 2 , (NH 4 ) 3 H (SO 4 ) 2 , LiHSO 4 , NaHS0 4 , KHSO 4 , RbSO 4 , LiN 2 H 5 SO 4 , NH 4 HSO 4 , Phosphates such as Zr 3 (PO 4 ) 4 , Zr (HPO 4 ) 2 , HZr 2 (PO 4 ) 3 , UO 2 PO 4 .3H 2 O, H 8 UO 2 PO 4 ,
- sulfates such as: CsHSO 4 , Fe (SO 4 ) 2 , (NH 4 ) 3 H (SO 4 ) 2 , LiHSO 4 , NaHS0 4 , KHSO 4 , RbSO 4 , LiN 2 H 5 SO 4 , NH 4 HSO 4 , Phosphates such as Zr 3 (PO 4 ) 4 ,
- HTiTaO 5 , HSbTeO 6 , H 5 Ti 4 O 9 , HSbO 3 , H 2 MoO 4 selenites and arsenides such as (NH 4 ) 3 H (SeO 4 ) 2 , UO 2 AsO 4 , (NH 4 ) 3 H (SeO 4 ) 2 , KH 2 AsO 4 ,
- Silicates such as zeolites, zeolites (NH 4 +), layered silicates, framework silicates, H-natrolites,
- Montmohllonite acids such as HCIO, SbF 5 fillers such as carbides, especially SiC, Si 3 N, fibers, especially glass fibers,
- Glass powders and / or polymer fibers preferably based on
- the membrane after the treatment in step D) comprises at most 80% by weight, preferably at most 50% by weight and particularly preferably at most 20% by weight of additives.
- this membrane can also contain perfluorinated sulfonic acid additives (preferably 0.1-20% by weight, preferably 0.2-15% by weight, very preferably 0.2-10% by weight). These additives improve performance, increase proximity to the cathode to increase oxygen solubility and diffusion, and decrease the adsorption of phosphoric acid and phosphate to platinum.
- perfluorinated sulfonic acid additives preferably 0.1-20% by weight, preferably 0.2-15% by weight, very preferably 0.2-10% by weight.
- Non-limiting examples of persulfonated additives are: trifluomethanesulfonic acid, Potassium trifluoromethanesulfonate, sodium trifluoromethanesulfonate, lithium trifluoromethanesulfonate, Ammoniumtrifluormethansulfonat, Kaliumperfluorohexansulfonat, Natriumperfluorohexansulfonat perfluorohexanesulphonate, lithium, ammonium perfluorohexanesulphonate, perfluorohexanesulphonic acid, Kaliumnonafluorbutänsulfonat, Natriumnonafluorbutansuifonat, Lithiumnonafluorbutansulfonat, Ammoniumnonafluorbutansulfonat, Cäsiumnonafluorbutansulfonat, Triethylammoniumperfluorohexasulf
- the flat structure according to step C) is formed by means of measures known per se (casting, spraying, knife coating, extrusion) which are known from the prior art for polymer film production.
- Suitable carriers are all carriers which are inert under the conditions. These carriers include, in particular, films made from polyethylene terephthalate (PET), polytetrafluoroethylene (PTFE), polyhexafluoropropylene, copolymers of PTFE with hexafluoropropylene, polyimides, polyphenylene sulfides (PPS) and polypropylene (PP).
- the solution can optionally be mixed with an easily evaporable organic solvent.
- the viscosity can be adjusted to the desired value and the formation of the membrane can be facilitated.
- the thickness of the flat structure according to step C) is preferably between 10 and 4000 ⁇ m, preferably between 15 and 3500 ⁇ m, in particular between 20 and 3000 ⁇ m, particularly preferably between 30 and 1500 ⁇ m and, very particularly preferably between 50 and 1200 ⁇ m.
- the treatment of the membrane in step D) is carried out in particular at temperatures in the range from 0 ° C. and 150 ° C., preferably at temperatures between 10 ° C. and 120 ° C., in particular between room temperature (20 ° C.) and 90 ° C.
- Hydrolysis liquid which comprises water and at least one oxygen acid of phosphorus and / or sulfur.
- the treatment is preferably carried out under normal pressure, but can also be carried out under the action of pressure.
- the hydrolysis liquid can be a solution, wherein the liquid can also contain suspended and / or dispersed constituents.
- the viscosity of the hydrolysis liquid can be in a wide range, and solvents can be added or the temperature increased to adjust the viscosity.
- the dynamic viscosity is preferably in the range from 0.1 to 10,000 mPa * s, in particular 0.2 to 2000 mPa * s, these values being able to be measured, for example, in accordance with DIN 53015.
- the treatment according to step D) can be carried out using any known method.
- the membrane obtained in step C) can be immersed in a liquid bath.
- the hydrolysis liquid can be sprayed onto the membrane.
- the hydrolysis liquid can be poured over the membrane.
- the latter methods have the advantage that the concentration of acid in the hydrolysis liquid remains constant during the hydrolysis.
- the first method is often less expensive to implement.
- the oxygen acids of phosphorus and / or sulfur include in particular phosphinic acid, phosphonic acid, phosphoric acid, hypodiphosphonic acid, hypodiphosphoric acid, oligophosphoric acids, sulfurous acid, disulfurous acid and / or sulfuric acid. These acids can be used individually or as a mixture.
- oxygen acids of phosphorus and / or sulfur include radically polymerizable monomers which comprise phosphonic acid and / or sulfonic acid groups
- Monomers comprising phosphonic acid groups are known in the art. These are compounds which have at least one carbon-carbon double bond and at least one phosphonic acid group.
- the two carbon atoms which form the carbon-carbon double bond preferably have at least two, preferably 3, bonds to groups which lead to a slight steric hindrance of the double bond.
- These groups include hydrogen atoms and halogen atoms, especially fluorine atoms.
- the polymer comprising phosphonic acid groups results from the polymerization product which is obtained by polymerizing the monomer comprising phosphonic acid groups alone or with further monomers and / or crosslinking agents.
- the monomer comprising phosphonic acid groups can comprise one, two, three or more carbon-carbon double bonds. Furthermore, the monomer comprising phosphonic acid groups may contain one, two, three or more phosphonic acid groups. In general, the monomer comprising phosphonic acid groups contains 2 to 20, preferably 2 to 10, carbon atoms.
- the monomer comprising phosphonic acid groups is preferably a compound of the formula
- R represents a bond, a divalent C1-C15 alkylene group, divalent C1-C15 alkyleneoxy group, for example ethyleneoxy group or divalent C5-C20 aryl or heteroaryl group, the above radicals in turn being halogen, -OH, COOZ, -CN, NZ 2 can be substituted,
- Z independently of one another hydrogen, C1-C15-alkyl group, C1-C15-
- R represents a bond, a divalent C1-C15 alkylene group, divalent C1-C15 alkyleneoxy group, for example ethyleneoxy group or divalent C5-C20 aryl or heteroaryl group, the above radicals in turn being halogen, -OH, COOZ, -CN, NZ 2 can be substituted,
- Z independently of one another hydrogen, C1-C15-alkyl group, C1-C15-
- A represents a group of the formulas COOR 2 , CN, CONR 2 2 , OR 2 and / or R 2 , wherein R 2 is hydrogen, a C1-C15-alkyl group, C1-C15-alkoxy group, ethyleneoxy group or C5-C20-aryl or heteroaryl group, the above radicals in turn being substituted by halogen, -OH, COOZ, -CN, NZ 2 R denotes a bond, a divalent C1-C15-alkylene group, divalent C1-C15-alkyleneoxy group, for example ethyleneoxy group or divalent C5-C20-aryl or heteroaryl group " , the above radicals in turn having halogen, -OH, COOZ, -CN, NZ 2 can be substituted, Z independently of one another hydrogen, C1-C15-alkyl group, C1-C15-
- Alkoxy group ethyleneoxy group or C5-C20-aryl or heteroaryl group, it being possible for the above radicals in turn to be substituted with halogen, -OH, -CN, and x is an integer 1, 2, 3, 4, 5, 6, 7, 8 , 9 or 10 means. ''
- the preferred monomers comprising phosphonic acid groups include alkenes which have phosphonic acid groups, such as ethenephosphonic acid, propenephosphonic acid, butenephosphonic acid; Acrylic acid and / or methacrylic acid compounds which have phosphonic acid groups, such as 2-phosphonomethyl-acrylic acid, 2-phosphonomethyl-methacrylic acid, 2-phosphonomethyl-acrylic acid amide and 2-phosphonomethyl-methacrylic acid amide.
- vinylphosphonic acid ethenephosphonic acid
- a preferred vinylphosphonic acid has a purity of more than 70%, in particular 90% and particularly preferably more than 97% purity.
- the monomers comprising phosphonic acid groups can also be used in the form of derivatives which can subsequently be converted into the acid, the conversion to the acid also being able to take place in the polymerized state.
- derivatives include in particular the salts, the esters, the amides and the halides of the monomers comprising phosphonic acid groups.
- the monomers comprising phosphonic acid groups can also be introduced onto and into the membrane after the hydrolysis. This can be done by means of measures known per se (for example spraying, dipping, etc.) which are known from the prior art.
- the ratio of the weight of the sum of phosphoric acid, polyphosphoric acid and the hydrolysis products of polyphosphoric acid to the weight of the radically polymerizable monomers, for example the monomers comprising phosphonic acid groups is preferably greater than or equal to 1: 2, in particular greater than or equal to 1: 1. and particularly preferably greater than or equal to 2: 1.
- the ratio of the weight of the sum of phosphoric acid, polyphosphoric acid and the hydrolysis products of polyphosphoric acid to the weight of the radically polymerizable monomers is preferably in the range from 1000: 1 to 3: 1, in particular 100: 1 to 5: 1 and particularly preferably 50: 1 to 10 :1.
- This ratio can easily be determined by conventional methods, in which the phosphoric acid, polyphosphoric acid and their hydrolysis products can be washed out of the membrane in many cases.
- the weight of the polyphosphoric acid and its hydrolysis products can be related to the phosphoric acid after complete hydrolysis. This generally also applies to the radically polymerizable monomers.
- Monomers comprising sulfonic acid groups are known in the art. These are connections that . have at least one carbon-carbon double bond and at least one sulfonic acid group.
- the two carbon atoms which form the carbon-carbon double bond preferably have at least two, preferably 3, bonds to groups which have little inhibition . the double bond.
- These groups include hydrogen atoms and halogen atoms, especially fluorine atoms.
- the polymer comprising sulfonic acid groups results from the polymerization product which is obtained by polymerization of the monomer comprising sulfonic acid groups alone or with further monomers and / or crosslinking agents.
- the monomer comprising sulfonic acid groups can comprise one, two, three or more carbon-carbon double bonds. Furthermore, the monomer comprising sulfonic acid groups may contain one, two, three or more sulfonic acid groups.
- the monomer comprising sulfonic acid groups contains 2 to 20, preferably 2 to 10, carbon atoms.
- the monomer comprising sulfonic acid groups is preferably a compound of the formula
- R represents a bond, a divalent C1-C15 alkylene group, divalent C1-C15 alkyleneoxy group, for example ethyleneoxy group or divalent C5-C20 aryl or heteroaryl group, the above radicals in turn being halogen, -OH, COOZ, -CN, NZ 2 can be substituted,
- Z independently of one another hydrogen, C1-C15-alkyl group, C1-C15-
- R represents a bond, a divalent C1-C15 alkylene group, divalent C1-C15 alkyleneoxy group, for example ethyleneoxy group or divalent C5-C20 aryl or heteroaryl group, the above radicals in turn being halogen, -OH, COOZ, -CN, NZ 2 can be substituted,
- Z independently of one another hydrogen, C1-C15-alkyl group, C1-C15-
- Alkoxy group ethyleneoxy group or C5-C20-aryl or heteroaryl group, it being possible for the above radicals in turn to be substituted with halogen, -OH, -CN, and x is an integer 1, 2, 3, 4, 5, 6, 7, 8 , 9 or 10 means
- A represents a group of the formulas COOR 2 , CN, CONR 2 2 , OR 2 and / or R 2 , wherein R 2 is hydrogen, a C1-C15-alkyl group, C1-C15-alkoxy group, ethyleneoxy group or C5-C20-aryl or heteroaryl group means the above radicals in turn can be substituted with halogen, -OH, COOZ, -CN, NZ 2
- R represents a bond, a divalent C1-C15 alkylene group, divalent C1-C15 alkyleneoxy group, for example ethyleneoxy group or divalent C5-C20 aryl or heteroaryl group, the above radicals in turn being halogen, -OH, COOZ, -CN, NZ 2 can be substituted,
- Z independently of one another hydrogen, C1-C15-alkyl group, C1-C15-
- Alkoxy group ethyleneoxy group or C5-C20-aryl or heteroaryl group, it being possible for the above radicals in turn to be substituted with halogen, -OH, -CN, and x is an integer 1, 2, 3, 4, 5, 6, 7, 8 , 9 or 10 means.
- the preferred monomers comprising sulfonic acid groups include alkenes which have sulfonic acid groups, such as ethene sulfonic acid, propene sulfonic acid, butene sulfonic acid; Acrylic acid and / or methacrylic acid compounds that have sulfonic acid groups, such as 2-sulfonomethyl-acrylic acid, 2-sulfonomethyl-methacrylic acid, 2-sulfonomethyl-acrylic acid amide and 2-sulfonomethyl-methacrylic acid amide.
- vinyl sulfonic acid ethene sulfonic acid
- Aldrich or Clariant GmbH is particularly preferably used.
- a preferred vinyl sulfonic acid has a purity of more than 70%, in particular 90% and particularly preferably more than 97% purity.
- the monomers comprising sulfonic acid groups can also be used in the form of derivatives which can subsequently be converted into the acid, the conversion to the acid also being able to take place in the polymerized state.
- derivatives include in particular the salts, the esters, the amides and the halides of the monomers comprising sulfonic acid groups.
- the monomers comprising sulfonic acid groups can also be introduced onto and into the membrane after the hydrolysis. This can be done by means of measures known per se (e.g. spraying, dipping, etc.) which are known from the prior art.
- monomers capable of crosslinking can be used. These monomers can be added to the hydrolysis liquid. In addition, the monomers capable of crosslinking can also be applied to the membrane obtained after the hydrolysis.
- the monomers capable of crosslinking are, in particular, compounds which have at least 2 carbon-carbon double bonds. Dienes, trienes, tetraenes, dimethylacrylates, trimethylacrylates, tetramethylacrylates, diacrylates, triacrylates, tetraacrylates are preferred.
- R is a C1-C15-alkyl group, C5-C20-aryl or heteroaryl group, NR ' , -SO 2 ,
- PR ' , Si (R ' ) 2 means, where the above radicals can in turn be substituted, R 'independently of one another hydrogen, a C1-C15-alkyl group, C1-C15-
- the substituents of the above radical R are preferably halogen, hydroxyl, carboxy, carboxyl, carboxyl esters, nitriles, amines, silyl, siloxane radicals.
- crosslinking agents are allyl methacrylate, ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, tetra- and polyethylene glycol dimethacrylate, 1,3-butanediol dimethacrylate, glycerol dimethacrylate, diurethane dimethacrylate, trimethylpropane trimethacrylate, for example Ebacryl, N ', N-methylenebisacrylamide, carbinol, butadiene, isoprene, chloroprene, divinylbenzene and / or bisphenol-A-dimethylacrylate.
- These compounds are commercially available, for example, from Sartomer Company Exton, Pennsylvania under the designations CN-120, CN104 and CN-980.
- crosslinking agents are optional, these compounds usually being in the range between 0.05 to 30% by weight, preferably 0.1 to 20% by weight, particularly preferably 1 and 10% by weight, based on the weight of the Membrane, can be used.
- the crosslinking monomers can be introduced onto and into the membrane after the hydrolysis. This can be done by means of measures known per se (e.g. spraying, dipping, etc.) which are known from the prior art.
- the monomers comprising phosphonic acid and / or sulfonic acid groups or the crosslinking monomers can be polymerized, the polymerization preferably taking place by free radicals.
- the radical formation can take place thermally, photochemically, chemically and / or electrochemically.
- a starter solution which contains at least one substance capable of forming radicals can be added to the hydrolysis liquid.
- a starter solution can be applied to the membrane after the hydrolysis. This can be done by means of measures known per se (e.g. spraying, dipping, etc.) which are known from the prior art.
- Suitable radical formers include azo compounds, peroxy compounds, persulfate compounds or azoamidines.
- Non-limiting examples are dibenzoyl peroxide, dicumyl peroxide, cumene hydroperoxide, diisopropyl, bis (4-t-butylcyclohexyl) peroxydicarbonate, Dikaliumpersulfat, ammonium peroxydisulfate, 2,2'-azobis (2-methylpropionitri! (AIBN), 2,2'-azobis- ( isobutyric acid amidine) hydrochloride, benzpinacol, dibenzyl derivatives, methyl ethylene ketone peroxide, 1, 1-azobiscyclohexane carbonitrile, methyl ethyl ketone peroxide, acetylacetone peroxide, dilauryiperoxide, didecanoyl peroxide, tert.-butylper-2-ethylhexanoate, ketone peroxid
- radical formers can also be used which form free radicals when irradiated.
- the preferred compounds include, among others, ⁇ -diethoxyacetophenone (DEAP, Upjon Corp), n-butylbenzoin ether (®Trigonal-14, AKZO) and 2,2-dimethoxy-2-phenylacetophenone (®lgacure 651) and 1-benzoylcyclohexanol (® Igacure 184), bis (2,4,6-trimethylbenzoyl) phenylphosphine oxide (®lrgacure 819) and 1- [4- (2-hydroxyethoxy) phenyl] -2-hydroxy-2-phenylpropan-1-one (®lrgacure 2959 ), each from Ciba Geigy Corp. are commercially available.
- radical generator can be varied depending on the desired degree of polymerization.
- IR InfraRot, ie light with a wavelength of more than 700 nm
- NIR Near IR, ie light with a wavelength in the range from approx. 700 to 2000 nm or an energy in the range of approx. 0.6 to 1.75 eV).
- the polymerization can also be carried out by exposure to UV light with a wavelength of less than 400 nm.
- This polymerization method is known per se and is described, for example, in Hans Joerg Elias, Macromolecular Chemistry, ⁇ .auflage, Volume 1, p.492-511; D.R. Arnold, N.C. Baird, J.R. Bolton, J.C. D. Brand, P.W. M Jacobs, P.de Mayo, W.R. Ware, Photochemistry-An Introduction, Academic Press, New York and M.K. Mishra, Radical Photopolymerization of Vinyl Monomers, J. Macromol. Sci.-Revs. Macromol. Chem. Phys. C22 (1982-1983) 409.
- the polymerization can also be achieved by the action of ⁇ , ⁇ and / or electron beams.
- the polymerization of the monomers comprising phosphonic acid and / or sulfonic acid groups or of the crosslinking monomers is preferably carried out at temperatures above room temperature (20 ° C.) and below 200 ° C., in particular at temperatures between 40 ° C. and 150 ° C., particularly preferably between 50 ° C and 120 ° C.
- the polymerization is preferably carried out under normal pressure, but can also be carried out under the action of pressure.
- the polymerization leads to a solidification of the flat structure, this solidification being able to be followed by microhardness measurement.
- the increase in hardness due to the polymerization is preferably at least 20%, based on the hardness of the sheet-like structure obtained in step B).
- the molar ratio of the molar sum of phosphoric acid, polyphosphoric acid and the hydrolysis products of polyphosphoric acid to the number of moles of the phosphonic acid groups and / or sulfonic acid groups in the polymers obtainable by polymerizing phosphonic acid groups and / or monomers comprising sulfonic acid groups, preferably greater than or equal to 1: 2, in particular greater than or equal to 1: 1. and particularly preferably greater than or equal to 2: 1.
- the molar ratio of the molar sum of phosphoric acid, polyphosphoric acid and the hydrolysis products of polyphosphoric acid to the number of moles of the phosphonic acid groups and / or sulfonic acid groups in the monomers comprising monomers comprising phosphonic acid groups and / or monomers comprising sulfonic acid groups is preferably in the range from 1000: 1 to 3: 1, in particular 100: 1 to 5: 1 and particularly preferably 50: 1 to 10: 1.
- the molar ratio can be determined using conventional methods. Spectroscopic methods, for example NMR spectroscopy, can be used for this purpose. It should be borne in mind here that the phosphonic acid groups are in the formal oxidation state 3 and the phosphorus in phosphoric acid, polyphosphoric acid or hydrolysis products thereof in the oxidation state 5.
- the flat structure which is obtained after the polymerization is a self-supporting membrane.
- the degree of polymerization is preferably at least 2, in particular at least 5, particularly preferably at least 30 repetition units, in particular at least 50 repetition units, very particularly preferably at least 100 repetition units.
- M n the number average molecular weight
- the proportion by weight of monomers comprising phosphonic acid groups and of radical initiators is kept constant in comparison with the ratios of the manufacture of the membrane.
- the conversion achieved in a comparative polymerization is preferably greater than or equal to 20%, in particular greater than or equal to 40% and particularly preferably greater than or equal to 75%, based on the monomers comprising phosphonic acid groups used.
- the hydrolysis liquid comprises water, and the concentration of the water is generally not particularly critical. According to a particular aspect of the present invention, the hydrolysis liquid comprises 5 to 80% by weight, preferably 8 to 70% by weight and particularly preferably 10 to 50% by weight of water. The amount of water that is formally contained in the oxygen acids is not taken into account in the water content of the hydrolysis liquid.
- acids phosphoric acid and / or sulfuric acid are particularly preferred, these acids comprising in particular 5 to 70% by weight, preferably 10 to 60% by weight and particularly preferably 15 to 50% by weight of water.
- the partial hydrolysis of the polyphosphoric acid in step D) leads to a solidification of the membrane and to a decrease in the layer thickness and formation of a membrane.
- the solidified membrane generally has a thickness of between 15 and 3000 ⁇ m, preferably 20 and 2000 ⁇ m, in particular between 20 and 1000 ⁇ m, the membrane being self-supporting.
- the upper temperature limit of the treatment in step D) is generally 150 ° C. With an extremely short exposure, the hydrolysis liquid can also be hotter than 150 ° C.
- the duration of the treatment is essential for the upper temperature limit.
- the membrane is cooled to room temperature in the hydrolysis liquid.
- the duration of treatment can be in a wide range, the duration depending in particular on the water concentration of the hydrolysis liquid. Furthermore, the treatment time depends on the thickness of the membrane.
- the duration of treatment is between 10 seconds and 20 hours, in particular 1 minute to 10 hours.
- the membrane obtained in step D) can be self-supporting, i.e. it can be detached from the carrier without damage and then, if necessary, processed or stored directly.
- the concentration of phosphoric acid and thus the conductivity of the polymer membrane according to the invention can be adjusted.
- the concentration of phosphoric acid is given as mole of acid per mole of repeating unit of the polymer.
- a concentration mol of phosphoric acid based on a repeating unit of the formula (III), i.e. polybenzimidazo! Between 10 and 100, in particular between 12 and 95, is preferred.
- Such high degrees of doping (concentrations) are very difficult or even impossible to obtain by doping polyazoles with commercially available orthophosphoric acid.
- the membrane can still be crosslinked by exposure to heat in the presence of oxygen.
- This hardening of the membrane additionally improves the properties of the membrane.
- the membrane can be heated to a temperature of at least 150 ° C., preferably at least 200 ° C. and particularly preferably at least 250 ° C.
- the oxygen concentration in this process step is usually in the range from 5 to 50% by volume, preferably 10 to 40% by volume, without any intention that this should impose a restriction.
- IR InfraRot, ie light with a wavelength of more than 700 nm
- NIR Near IR, ie light with a wavelength in the range from approx. 700 to 2000 nm or an energy in the range of approx. 0.6 to 1.75 eV).
- Another method is radiation with ⁇ -rays. The radiation dose is between 5 and 200 kGy.
- the duration of the crosslinking reaction can be in a wide range. In general, this response time is in the range from 1 second to 10 hours, preferably 1 minute to 1 hour, without this being intended to impose any restriction.
- the polymer membrane according to the invention has improved material properties compared to the previously known doped polymer membranes. In particular, they perform better than known doped polymer membranes. This is due in particular to an improved proton conductivity. At temperatures of 120 ° C., this is at least 0.1 S / cm, preferably at least 0.11 S / cm, in particular at least 0.12 S / cm.
- The. specific conductivity is measured by means of impedance spectroscopy in a 4-pole arrangement in potentiostatic mode and using platinum electrodes (wire, 0.25 mm diameter). The distance between the current-consuming electrodes is 2 cm.
- the spectrum obtained is evaluated using a simple model consisting of a parallel arrangement of an ohmic resistance and a capacitor.
- the sample cross-section of the phosphoric acid-doped membrane is measured immediately before the sample assembly. To measure the temperature dependency, the measuring cell is brought to the desired temperature in an oven and controlled via a Pt-100 thermocouple positioned in the immediate vicinity of the sample. After reaching the temperature, the sample is kept at this temperature for 10 minutes before starting the measurement.
- the membranes have high mechanical stability. This size results from the hardness of the membrane, which is determined by means of microhardness measurement in accordance with DIN 50539.
- the membrane is successively loaded with a Vickers diamond within 20 s up to a force of 3 mN and the depth of penetration is determined.
- the hardness at room temperature is at least 5 mN / mm 2 , preferably at least 50 mN / mm 2 and very particularly preferably at least 200 mN / mm 2 , without any intention that this should impose a restriction.
- the force is then kept constant at 3 mN for 5 s and the creep is calculated from the penetration depth.
- the creep CHU 0.003 / 20/5 under these conditions is less than 30%, preferably less than 15% and very particularly preferably less than 5%.
- the module determined by means of microhardness measurement is YHU at least 0.1 MPa, in particular at least 2 MPa and very particularly preferably at least 5 MPa, without this being intended to impose a restriction.
- the membranes obtained by the process according to the invention have particularly good mechanical properties.
- the fracture toughness is surprisingly high with a high phosphoric acid content.
- new polymer electrolyte membranes which have a phosphoric acid concentration of at least 85% by weight with a fracture toughness of at least 30 kJ / m 2 , in particular 50 kJ / m 2 and particularly preferably 100 kJ / m 2 .
- preferred polymer electrolyte membranes have a high elongation at break of at least 60%, in particular at least 80% and particularly preferably at least 100% at a phosphoric acid concentration of at least 85% by weight.
- Particularly powerful new polymer electrolyte membranes are obtained according to the invention which, at a phosphoric acid concentration of at least 95% by weight, have a fracture toughness of at least 10 kJ / m 2 , in particular 20 kJ / m 2 and particularly preferably 30 kJ / m 2 .
- the elongation at break / stress can be measured on strip-shaped samples with a width of 15 mm and a length of 120 mm on the Zwick Z010.
- the tensile test can be carried out at a temperature of 25 ° C with an expansion rate of 50 mm / min.
- Possible areas of application of the polymer membranes according to the invention include use in fuel cells, in electrolysis, in capacitors and in battery systems.
- the present invention also relates to a membrane electrode unit which has at least one polymer membrane according to the invention.
- the membrane electrode unit has a high performance even with a low content of catalytically active substances, such as platinum, ruthenium or palladium.
- catalytically active substances such as platinum, ruthenium or palladium.
- gas diffusion layers provided with a catalytically active layer can be used.
- Gas diffusion diffusion generally shows electron conductivity.
- Flat, electrically conductive and acid-resistant structures are usually used for this. These include, for example, carbon fiber papers, graphitized carbon fiber papers, carbon fiber fabrics, graphitized carbon fiber fabrics and / or flat structures which have been made conductive by adding carbon black.
- the catalytically active layer contains a catalytically active substance.
- a catalytically active substance include noble metals, in particular platinum, palladium, rhodium, iridium and / or ruthenium. These substances can also be used with one another in the form of alloys. Furthermore, these substances can also be used in alloys with base metals, such as Cr, Zr, Ni, Co and / or Ti. In addition, the oxides of the aforementioned noble metals and / or base metals can also be used.
- the catalytically active compounds are used in the form of particles which preferably have a size in the range from 1 to 1000 nm, in particular 10 to 200 nm and preferably 20 to 100 nm.
- the catalytically active layer can contain conventional additives. These include fluoropolymers such as Polytetrafluoroethylene (PTFE) and surface-active substances.
- fluoropolymers such as Polytetrafluoroethylene (PTFE) and surface-active substances.
- the weight ratio of fluoropolymer to catalyst material is greater than 0.1, this ratio preferably being in the range from 0.2 to 0.6.
- the catalyst layer has a thickness in the range from 1 to 1000 ⁇ m, in particular from 5 to 500, preferably from 10 to 300 ⁇ m.
- This value represents an average value that can be determined by measuring the layer thickness in the cross section of images that can be obtained with a scanning electron microscope (SEM).
- the noble metal content of the catalyst layer is 0.1 to 10.0 mg / cm 2 , preferably 0.3 to 6.0 mg / cm 2 and particularly preferably 0.3 to 3.0 mg / cm 2 , These values can be determined by elemental analysis of a flat sample.
- a catalytically active layer can be applied to the membrane according to the invention and this can be connected to a gas diffusion layer.
- the present invention also relates to a membrane electrode unit which contains at least one polymer membrane according to the invention, optionally in combination with a further polymer membrane based on polyazoles or a polymer blend membrane.
- a catalytically active layer can be applied to the membrane according to the invention and this can be connected to a gas diffusion layer.
- a membrane is formed in accordance with steps A) to D) and the catalyst is applied.
- the membrane according to steps A) to D) can also be formed on a support or a support film which already has the catalyst. After removing the carrier or the carrier film, the catalyst is on the membrane according to the invention.
- the present invention likewise relates to a membrane-electrode unit which has at least one coated electrode and / or at least one polymer membrane according to the invention in combination with a further polymer membrane based on polyazoles or a polymer blend membrane containing at least one polymer based on polyazoles.
- the highly viscous solution was knife-coated at 200 ° C. with a preheated doctor blade on a polyethylene terephthalate film (PET film) with a 500 ⁇ m thick membrane.
- PET film polyethylene terephthalate film
- one piece of membrane with the size 20x30 cm was placed in 11 H 3 PO 4 with the following concentration.
- Example 1 40% H 3 PO 4
- Example 2 50% H 3 PO 4
- Example 3 60% H 3 PO 4
- Example 4 70% H 3 PO 4
- Example 5 80% H 3 PO 4
- the highly viscous solution was knife-coated at 160 ° C. using a preheated doctor blade on a PET film with a thickness of 500 ⁇ m.
- One piece of membrane with the size 20x30 cm was hydrolyzed in 11 H 3 P0 with the following concentration and time.
- Comparison 1 hydrolyzed with air humidity, 24 hours at room temperature
- Example 6 in 50% H 3 PO 4 20 min.
- Example 7 in 60% H 3 PO 4 1 h.
- Example 8 in 70% H 3 PO 4 2 h
- the membranes were titrated with 0.1 N NaOH to determine the acid number per repeat unit.
- the titration results are summarized in Table 2 below.
- the material properties were determined with tensile strain measurement and compared with Comparative Example 1 (Table 3).
- the elongation at break / stress (fracture toughness) is measured on strip-shaped samples with a width of 15 mm and a length of 120 mm on the Zwick Z010.
- the tensile test is carried out at a temperature of 25 ° C with an expansion rate of 50 mm / min.
- the resting potential is directly linked to the permeability of the membrane to the fuel.
- a high resting potential therefore means a low hydrogen permeability (see Handbook of Fuel Cells Fundamentals, Technology and Application, Editors: W. Dahlstich; A. Lamm, H.A. Gasteiger).
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Abstract
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DE10239701A DE10239701A1 (de) | 2002-08-29 | 2002-08-29 | Polymerfolie auf Basis von Polyazolen und deren Verwendung |
DE10239701 | 2002-08-29 | ||
DE10330461 | 2003-07-05 | ||
DE2003130461 DE10330461A1 (de) | 2003-07-05 | 2003-07-05 | Verfahren zur Herstellung von protonenleitenden Polymermembranen, verbesserte Polymermembranen und deren Anwendung in Brennstoffzellen |
PCT/EP2003/009018 WO2004024796A1 (fr) | 2002-08-29 | 2003-08-14 | Procede pour produire des membranes polymeres conductrices de protons, membranes polymeres perfectionnees et leur utilisation dans des piles a combustible |
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DE10209419A1 (de) | 2002-03-05 | 2003-09-25 | Celanese Ventures Gmbh | Verfahren zur Herstellung einer Polymerelektrolytmembran und deren Anwendung in Brennstoffzellen |
EP1483316B1 (fr) | 2002-03-06 | 2007-09-19 | Pemeas GmbH | Membrane electrolytique conductrice de protons a permeabilite reduite au methanol et son utilisation dans des piles a combustible |
DE10258580A1 (de) * | 2002-12-16 | 2004-06-24 | Celanese Ventures Gmbh | Hochmolekular Polyazole |
WO2005011039A2 (fr) * | 2003-07-27 | 2005-02-03 | Pemeas Gmbh | Membrane a conduction de protons et utilisation correspondante |
KR100570745B1 (ko) | 2003-10-30 | 2006-04-12 | 삼성에스디아이 주식회사 | 폴리(2,5-벤즈이미다졸)의 제조방법 |
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- 2003-08-14 JP JP2004571736A patent/JP2005537384A/ja not_active Ceased
- 2003-08-14 CN CNB038203642A patent/CN1309762C/zh not_active Expired - Fee Related
- 2003-08-14 KR KR1020057003356A patent/KR101010180B1/ko not_active IP Right Cessation
- 2003-08-14 EP EP03794874A patent/EP1537164A1/fr not_active Withdrawn
- 2003-08-14 US US10/524,194 patent/US7883818B2/en not_active Expired - Fee Related
- 2003-08-14 CA CA002496589A patent/CA2496589A1/fr not_active Abandoned
- 2003-08-14 WO PCT/EP2003/009018 patent/WO2004024796A1/fr active Application Filing
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Also Published As
Publication number | Publication date |
---|---|
CA2496589A1 (fr) | 2004-03-25 |
KR20050043921A (ko) | 2005-05-11 |
CN1309762C (zh) | 2007-04-11 |
KR101010180B1 (ko) | 2011-01-20 |
WO2004024796A1 (fr) | 2004-03-25 |
CN1678662A (zh) | 2005-10-05 |
US7883818B2 (en) | 2011-02-08 |
US20060127705A1 (en) | 2006-06-15 |
JP2005537384A (ja) | 2005-12-08 |
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