CN114716676A - Application of polyimide in gas separation membrane - Google Patents
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- CN114716676A CN114716676A CN202210511581.XA CN202210511581A CN114716676A CN 114716676 A CN114716676 A CN 114716676A CN 202210511581 A CN202210511581 A CN 202210511581A CN 114716676 A CN114716676 A CN 114716676A
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- polyimide
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- 229920001721 polyimide Polymers 0.000 title claims abstract description 71
- 239000004642 Polyimide Substances 0.000 title claims abstract description 60
- 238000000926 separation method Methods 0.000 title claims abstract description 48
- 239000012528 membrane Substances 0.000 title claims abstract description 41
- 239000003960 organic solvent Substances 0.000 claims abstract description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 63
- 239000007789 gas Substances 0.000 claims description 59
- RLSSMJSEOOYNOY-UHFFFAOYSA-N m-cresol Chemical compound CC1=CC=CC(O)=C1 RLSSMJSEOOYNOY-UHFFFAOYSA-N 0.000 claims description 44
- 239000007787 solid Substances 0.000 claims description 41
- 229920000642 polymer Polymers 0.000 claims description 34
- 239000011521 glass Substances 0.000 claims description 28
- 239000002904 solvent Substances 0.000 claims description 21
- 238000003756 stirring Methods 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 17
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid group Chemical group C(C1=CC=CC=C1)(=O)O WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 claims description 16
- 238000001914 filtration Methods 0.000 claims description 16
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 claims description 15
- 239000000178 monomer Substances 0.000 claims description 14
- 238000003892 spreading Methods 0.000 claims description 14
- 230000007480 spreading Effects 0.000 claims description 14
- 238000002360 preparation method Methods 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 11
- 239000003054 catalyst Substances 0.000 claims description 9
- 238000006116 polymerization reaction Methods 0.000 claims description 9
- 239000005711 Benzoic acid Substances 0.000 claims description 8
- 235000010233 benzoic acid Nutrition 0.000 claims description 8
- 238000010345 tape casting Methods 0.000 claims description 8
- LLLMDRXIQZOTJE-UHFFFAOYSA-N 1,5-diazocine Chemical compound C1=CN=CC=CN=C1 LLLMDRXIQZOTJE-UHFFFAOYSA-N 0.000 claims description 7
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 claims description 5
- KGVOLFXAKOWTCR-UHFFFAOYSA-N cbdive_012173 Chemical compound C12=CC=C(N)C=C2C2C3=CC=C(N)C=C3C1C1=CC=CC=C12 KGVOLFXAKOWTCR-UHFFFAOYSA-N 0.000 claims description 5
- 150000001875 compounds Chemical class 0.000 claims description 5
- YBYIRNPNPLQARY-UHFFFAOYSA-N 1H-indene Chemical compound C1=CC=C2CC=CC2=C1 YBYIRNPNPLQARY-UHFFFAOYSA-N 0.000 claims description 4
- FJKROLUGYXJWQN-UHFFFAOYSA-N 4-hydroxybenzoic acid Chemical compound OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 claims description 4
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 4
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 4
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 4
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 229920005575 poly(amic acid) Polymers 0.000 claims description 4
- 239000011261 inert gas Substances 0.000 claims description 3
- CJAOGUFAAWZWNI-UHFFFAOYSA-N 1-n,1-n,4-n,4-n-tetramethylbenzene-1,4-diamine Chemical compound CN(C)C1=CC=C(N(C)C)C=C1 CJAOGUFAAWZWNI-UHFFFAOYSA-N 0.000 claims description 2
- ZVDSMYGTJDFNHN-UHFFFAOYSA-N 2,4,6-trimethylbenzene-1,3-diamine Chemical compound CC1=CC(C)=C(N)C(C)=C1N ZVDSMYGTJDFNHN-UHFFFAOYSA-N 0.000 claims description 2
- UAIUNKRWKOVEES-UHFFFAOYSA-N 3,3',5,5'-tetramethylbenzidine Chemical compound CC1=C(N)C(C)=CC(C=2C=C(C)C(N)=C(C)C=2)=C1 UAIUNKRWKOVEES-UHFFFAOYSA-N 0.000 claims description 2
- GDGWSSXWLLHGGV-UHFFFAOYSA-N 3-(4-aminophenyl)-1,1,3-trimethyl-2h-inden-5-amine Chemical compound C12=CC(N)=CC=C2C(C)(C)CC1(C)C1=CC=C(N)C=C1 GDGWSSXWLLHGGV-UHFFFAOYSA-N 0.000 claims description 2
- UPKFUQPLTMHGKQ-UHFFFAOYSA-N 4-(4-aminophenyl)-2,3,6-trimethylaniline Chemical group CC1=C(N)C(C)=CC(C=2C=CC(N)=CC=2)=C1C UPKFUQPLTMHGKQ-UHFFFAOYSA-N 0.000 claims description 2
- 229940090248 4-hydroxybenzoic acid Drugs 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- KQSABULTKYLFEV-UHFFFAOYSA-N naphthalene-1,5-diamine Chemical compound C1=CC=C2C(N)=CC=CC2=C1N KQSABULTKYLFEV-UHFFFAOYSA-N 0.000 claims description 2
- 239000012716 precipitator Substances 0.000 claims description 2
- 230000008569 process Effects 0.000 claims description 2
- 230000001502 supplementing effect Effects 0.000 claims description 2
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 230000001376 precipitating effect Effects 0.000 claims 1
- GTDPSWPPOUPBNX-UHFFFAOYSA-N ac1mqpva Chemical compound CC12C(=O)OC(=O)C1(C)C1(C)C2(C)C(=O)OC1=O GTDPSWPPOUPBNX-UHFFFAOYSA-N 0.000 abstract description 11
- WKDNYTOXBCRNPV-UHFFFAOYSA-N bpda Chemical class C1=C2C(=O)OC(=O)C2=CC(C=2C=C3C(=O)OC(C3=CC=2)=O)=C1 WKDNYTOXBCRNPV-UHFFFAOYSA-N 0.000 abstract description 5
- 150000004984 aromatic diamines Chemical class 0.000 abstract 1
- 230000035699 permeability Effects 0.000 description 68
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 32
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 32
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 28
- 229910002092 carbon dioxide Inorganic materials 0.000 description 17
- 239000001569 carbon dioxide Substances 0.000 description 16
- 229910052757 nitrogen Inorganic materials 0.000 description 16
- 238000012360 testing method Methods 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 10
- 239000001257 hydrogen Substances 0.000 description 10
- 229910052739 hydrogen Inorganic materials 0.000 description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 9
- 239000001301 oxygen Substances 0.000 description 9
- 229910052760 oxygen Inorganic materials 0.000 description 9
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 8
- 229960001701 chloroform Drugs 0.000 description 7
- 230000009477 glass transition Effects 0.000 description 7
- 238000001612 separation test Methods 0.000 description 7
- 238000000944 Soxhlet extraction Methods 0.000 description 6
- 229940026110 carbon dioxide / nitrogen Drugs 0.000 description 6
- 238000001704 evaporation Methods 0.000 description 6
- 239000012535 impurity Substances 0.000 description 6
- 238000010907 mechanical stirring Methods 0.000 description 6
- 239000012299 nitrogen atmosphere Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 230000004580 weight loss Effects 0.000 description 6
- 239000000956 alloy Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000004305 biphenyl Substances 0.000 description 3
- -1 2,2 '-bis (2' -trifluoromethylphenyl) -4,4',5,5' -biphenyltetracarboxylic Chemical compound 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 235000010290 biphenyl Nutrition 0.000 description 2
- 125000006267 biphenyl group Chemical group 0.000 description 2
- 125000006159 dianhydride group Chemical group 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 238000002329 infrared spectrum Methods 0.000 description 2
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N phenylbenzene Natural products C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 125000006158 tetracarboxylic acid group Chemical group 0.000 description 2
- ZYESCHFPSVZSNA-UHFFFAOYSA-N 2,3-dimethyl-1-naphthalen-1-ylnaphthalene Chemical group C1=CC=C2C(C=3C4=CC=CC=C4C=C(C=3C)C)=CC=CC2=C1 ZYESCHFPSVZSNA-UHFFFAOYSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000005102 attenuated total reflection Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007791 dehumidification Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 150000004985 diamines Chemical class 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000000655 nuclear magnetic resonance spectrum Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000002798 polar solvent Substances 0.000 description 1
- 229920005597 polymer membrane Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000002336 sorption--desorption measurement Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
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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
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1067—Wholly aromatic polyimides, i.e. having both tetracarboxylic and diamino moieties aromatically bound
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
- B01D53/228—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion characterised by specific membranes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/58—Other polymers having nitrogen in the main chain, with or without oxygen or carbon only
- B01D71/62—Polycondensates having nitrogen-containing heterocyclic rings in the main chain
- B01D71/64—Polyimides; Polyamide-imides; Polyester-imides; Polyamide acids or similar polyimide precursors
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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
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1003—Preparatory processes
- C08G73/1007—Preparatory processes from tetracarboxylic acids or derivatives and diamines
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- 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
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1039—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors comprising halogen-containing substituents
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- 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
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1085—Polyimides with diamino moieties or tetracarboxylic segments containing heterocyclic moieties
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Abstract
The invention discloses an application of polyimide in a gas separation membrane, wherein 2,2' -disubstituted BPDA-based dianhydride with a twisted structure series is introduced to polymerize with different aromatic diamines to obtain the polyimide shown in a formula (I), and the gas separation membrane prepared from the polyimide has good solubility in various organic solvents, improves the gas permeation quantity and the specific surface area, has good mechanical property and thermal stability, has good selectivity while improving the permeation quantity, and plays an important role in gas separation;
Description
Technical Field
The invention belongs to the technical field of polymer membrane separation, and particularly relates to application of polyimide in a gas separation membrane.
Background
Gas separation membranes have been developed and put into practical use as commercial membranes for hydrogen separation in the 80 s, and gas separation membranes have been developed and put into practical use by utilizing the difference in the gas permeation amount of the membranes, and have been used for concentrating and separating target gases from two or more gases mixed together. The gas separation membrane technology is an emerging 'green technology', is widely applied due to low energy consumption, simple equipment and small occupied area, and plays an important role in hydrogen separation, carbon dioxide separation, air dehumidification and organic solvent separation.
Polyimide has the advantages of good film forming property, solvent resistance, heat resistance, high mechanical strength and the like, and can be used for a gas separation membrane, and whether the separation performance of the gas separation membrane has good gas permeability and high selectivity is judged. In 1991, Robeson proposed a limit for polymer properties, expressed as upper bound properties (upper bound), which was updated in 2008 and 2015, considering that the relationship between gas permeability and selectivity is such a trade-off. Therefore, researchers are focusing on preparing gas separation membranes with high permeability, good selectivity, high mechanical properties and breakthrough of the upper limit characteristics.
The traditional polyimide gas separation membrane usually has good gas selectivity, but the gas permeability of the membrane is not high, the performance of the membrane is often improved by a modification method, the polyimide gas separation membrane is modified by introducing functional side groups and flexible groups, a twisted and non-coplanar structure and non-coplanar dianhydride, so that the flexibility of a molecular chain can be limited, the free volume in a molecule is increased, the permeability of the polyimide gas separation membrane can be effectively improved, and some larger groups (such as-CF) are introduced3，-CH3Group) can reduce the flexibility of a molecular main chain, thereby increasing the free volume and improving the gas permeability, and the invention aims to introduce 2,2' -disubstituted BPDA-based dianhydride with a twisted structure, thereby improving the gas permeability, so as to obtain a polyimide gas separation membrane with high selectivity and good gas permeability.
Disclosure of Invention
In order to overcome the defect that the gas separation selectivity and the gas permeability of the traditional polyimide can not be improved simultaneously, the invention provides polyimide, a preparation method thereof and application thereof in a gas separation membrane. The dianhydride has a strong rigid structure by introducing a twisted and non-coplanar structure into the dianhydride, and is polymerized with the self-polymerization microporous diamine to improve the permeability of the polyimide gas separation membrane and simultaneously have good gas selectivity.
The design idea of the invention is as follows: a series of 2,2' -disubstituted BPDA-based dianhydrides with twisted structures are adopted, and the twisted structures are utilized to form a larger numberTo reduce flexibility between molecular chains, to increase free volume between molecules, and to introduce-CF3And thereby improving gas permeability.
The technical scheme of the invention is as follows:
a polyimide having a structure represented by the following formula (I):
wherein n represents the degree of polymerization, and n is a positive integer of 10-500;
r is selected from any one or more of the following structural groups (the dotted line represents the position where the amino group is attached):
R1any one selected from the following structural groups (the dotted line represents the attachment position of the functional group):
the preparation method of the polyimide shown in the formula (I) comprises the following steps:
(1) under the protection of inert gas, mixing the monomer A, the monomer B and a catalyst, adding a solvent to prepare a solution with the solid content of 10-20 wt%, stirring, and heating to 70-90 ℃ to react for 1-3 hours to obtain a polyamic acid solution;
the molar ratio of the monomer A to the monomer B to the catalyst is 1: 1: 0.5;
the catalyst is selected from benzoic acid and/or p-hydroxybenzoic acid;
the solvent is selected from one or more of m-cresol, N-dimethylformamide, N-dimethylacetamide and N-methylpyrrolidone;
the inert gas comprises nitrogen, helium and argon;
(2) heating the system in the step (1) to 180-200 ℃, continuously reacting for 8-12 h to dehydrate the polyamic acid solution to form a polyimide solution, and supplementing a solvent (the same as the solvent used in the step (1)) to reduce the solid content of the system to 8-10 wt%;
(3) cooling the system in the step (2) to 60-80 ℃, pouring the cooled system into a precipitator under the stirring condition to obtain a filamentous polymer, and filtering, washing, purifying and drying the filamentous polymer to obtain polyimide shown in the formula (I);
the precipitant is selected from one or more of methanol, ethanol and water;
the purification is carried out by adopting a Soxhlet extractor, the obtained polymer is placed in the Soxhlet extractor, a solvent methanol and/or ethanol is added, and the mixture is heated and refluxed for 24-48 h at the temperature of 70-90 ℃ to complete the purification treatment;
the drying is carried out for 12-18 h at 100-120 ℃ under the vacuum condition;
in the above preparation method, the monomer a is selected from any one or more of the following compounds:
the monomer B is selected from any one or more of the following compounds:
2, 8-diamino-4, 10-dimethyl-6H, 12H-5, 11-methylbenzyl [ b, f ] [1,5] diazocine, 3, 9-diamino-4, 10-dimethyl-6H, 12H-5, 11-methylbenzyl [ b, f ] [1,5] diazocine, 2, 6-diaminotriptycene, 2,4, 6-trimethylm-phenylenediamine, 2 '-bis (trimethyl) -4,4' -diaminobiphenyl, 2 '-diamino-3, 3' -dimethyl-9, 9 '-spirobifluorene, 6-amino-1- (4-aminophenyl) -1,3, 3-trimethylindene, 4' -diamino-3, 3' dimethylbinaphthyl, 5,5' -diamino-3, 3,3',3' -tetramethyl-2, 2', 3,3' -tetrahydro-1, 1' -spirobis [ indene ], tetramethyl-p-phenylenediamine, 3,3',5,5' -tetramethyl benzidine, 1, 5-naphthalenediamine;
the monomers A and B have no special meaning, and the labels "A" and "B" are only used for distinguishing different types of monomer compounds.
The polyimide shown in the formula (I) can be applied to preparing a gas separation membrane, and the specific preparation method comprises the following steps:
dissolving polyimide shown in a formula (I) in an organic solvent to prepare a solution with the mass fraction of 1-10%, then spreading a membrane by adopting a tape casting method, filtering the solution by using a filter head with the diameter of 0.45-1 mu m, pouring the solution on a clean glass dish or a glass plate to uniformly spread the solution (no bubbles exist in the solution), heating the solution according to a temperature programming method, drying the solution in vacuum at the temperature of 60-120 ℃ for 12-24 hours, and then demoulding to obtain a polyimide gas separation membrane;
the organic solvent is selected from one or more of trichloromethane, dichloromethane, N-methylpyrrolidone, tetrahydrofuran, N-dimethylformamide, N-dimethylacetamide, acetone, m-cresol and dimethyl sulfoxide;
the thickness of the polyimide gas separation membrane is 40-80 mu m, the maximum specific surface area can reach 597 g/square meter and CO2The permeability coefficient of the alloy can reach 1008barrer at most, and the pair of the alloy and the alloy is O2The permeability coefficient of the catalyst can reach 150barrer at most, the permeability coefficient of the catalyst for hydrogen can reach 619barrer at most, the catalyst has high flux and good selectivity, and can be used for gas separation.
Compared with the prior art, the invention has the beneficial effects that:
the invention can limit the flexibility among molecular chains and increase the free volume in the molecule by introducing a twisted series of 2,2' -disubstituted BPDA-based dianhydrides, thereby improving the gas permeability, and introducing a plurality of larger groups (such as-CF)3，-CH3Groups) can reduce the flexibility of the molecular main chain, thereby increasing the free volume and improving the gas permeability.
The polyimide gas separation membrane prepared by the invention can be well dissolved in various polar solvents, has high permeability to various gases, and can achieve a permeability coefficient for nitrogen up to 53.8barrer, a permeability coefficient for methane up to 57.83barrer, a permeability coefficient for hydrogen up to 648.05barrer, a permeability coefficient for oxygen up to 156.65barrer, and a permeability coefficient for carbon dioxide up to 764.3barrer when the obtained polyimide gas separation membrane is tested. The carbon dioxide/methane separation factor was 13.20 and the oxygen/nitrogen separation factor was 2.91. Can be used for recovering carbon dioxide in the oil exploitation process and separating carbon dioxide in natural gas.
The polyimide gas separation membrane prepared by the invention also has good mechanical property and thermal stability, and the solubility is also good. The temperature of 5 percent of thermal decomposition can reach 555 ℃, the glass transition temperature can reach 465 ℃, and the tensile strength is 60-100 MPa.
Description of the drawings:
FIG. 1 shows the nuclear magnetic spectrum of the polymer obtained in example 1.
FIG. 2 is a thermogravimetric plot of the polymer obtained in example 1.
FIG. 3 is a DMA curve of the polymer obtained in example 1.
FIG. 4 is an IR spectrum of the polymer obtained in example 1.
FIG. 5 is an adsorption/desorption curve of the polymer obtained in example 1.
Detailed Description
The invention is further described below by means of specific examples, without the scope of protection of the invention being limited thereto.
Example 1
In this embodiment, the polyimide has the structure of the formula:
the preparation of the polyimide gas separation membrane mainly comprises the following steps:
under the protection of nitrogen atmosphere, 0.5841g (1.3mmol) of 2,2' -diphenyl-4, 4',5,5' diphenyl tetracarboxylic dianhydride, 0.3668(1.3mmol) of 3, 9-diamino-4, 10-dimethyl-6H, 12H-5, 11-methyl-diphenyl [ b, f ] [1,5] diazocine and 0.0855g (0.65mmol) of benzoic acid are placed in a three-port polymerization bottle, then 3.80g of anhydrous m-cresol is added to make the solid content of the whole system be 20 wt%, mechanical stirring is adjusted to about 200r/min, the system is heated to 80 ℃ and stirred for 2H to be completely dissolved to form a relatively transparent light yellow solution, after the solid is completely dissolved, the system is heated to 180 ℃ for thermal imidization, the polyimide is completely thermally imidized after reaction is carried out for about 10H, 4.76g of m-cresol is added to make the solid content of the system be reduced to 10 wt%, and (2) closing heating, cooling to 80 ℃, placing 300ml of methanol on a magnetic stirrer for stirring, slowly pouring the reaction solution into the methanol to obtain white filamentous fibrous solid, continuously placing the white filamentous fibrous solid on the magnetic stirrer for stirring for 2 hours, filtering the filamentous object, placing the filamentous object on a Soxhlet extractor for Soxhlet extraction by the methanol for 12 hours so as to remove the residual m-cresol solvent in the polymer, and then drying the filamentous object under vacuum at 120 ℃ to obtain the polyimide with the structure.
Dissolving the polymer (0.5g) in chloroform (24.5ml) to prepare a solution with the solid content of 2%, fully stirring until the polymer is completely dissolved, filtering out insoluble substances by using a filter head with the thickness of 0.45 mu m, spreading a film by adopting a tape casting method, flatly spreading the film on a clean glass dish, shaking the film uniformly until no bubbles exist, covering the film by using a slightly larger glass dish to prevent impurities from falling into the glass dish, putting the glass dish in a glass box, gradually evaporating the solvent to dryness to form a film at room temperature, and taking down the film by using tweezers to obtain the polyimide film, wherein the thickness of the obtained polyimide film is 68 mu m.
The surface area is 560 g/square meter by BET test, the permeability coefficient of nitrogen is 38.22barrer, the permeability coefficient of oxygen is 143.8barrer, the permeability coefficient of hydrogen is 543.6barrer, the permeability coefficient of methane is 56.98barrer, the permeability coefficient of carbon dioxide is 775.5barrer, the permeability selectivity of carbon dioxide/methane is 13.61, the permeability selectivity of carbon dioxide/nitrogen is 20.29, the temperature of 5% thermal weight loss under nitrogen condition is 457 ℃, and the glass transition temperature is 457 ℃ by gas separation test under the conditions of 1barrer and 35 ℃.
Example 2
In this embodiment, the polyimide has the structure of the formula;
the preparation of the polyimide gas separation membrane mainly comprises the following steps:
1.5049g (2.58mmol) of 2,2 '-bis (2' -trifluoromethylphenyl) -4,4',5,5' -biphenyltetracarboxylic dianhydride, 0.7253g (2.58mmol) of 3, 9-diamino-4, 10-dimethyl-6H, 12H-5, 11-methylbenzene [ b, f ] [1,5] diazocine and 0.1578g (1.29mmol) of benzoic acid are put into a three-opening polymerization bottle under the protection of nitrogen atmosphere, then 8.92g of anhydrous m-cresol is added to make the solid content of the whole system 20 wt%, mechanical stirring is adjusted to about 200r/min, the system is heated to 80 ℃ and stirred for 2H to completely dissolve the solid to form a relatively transparent pale yellow solution, after the solid is completely dissolved, the system is heated to 180 ℃ to carry out thermal imidization, the reaction is carried out for about 10H to completely heat the polyimide, adding 13.63g of m-cresol to reduce the solid content of the system to 9 wt%, closing the heating, reducing the temperature to 80 ℃, placing 300ml of methanol on a magnetic stirrer for stirring, slowly pouring the reaction solution into the methanol to obtain white filamentous solid, continuously placing the white filamentous solid on the magnetic stirrer for stirring for 2 hours, filtering the filamentous object, placing the filamentous object on a Soxhlet extractor for Soxhlet extraction for 12 hours by using methanol so as to remove the residual m-cresol solvent in the polymer, and then drying the filamentous object under vacuum at 120 ℃ to obtain the polyimide with the structure.
Dissolving the polymer (0.5g) in chloroform (24.5ml) to prepare a solution with the solid content of 2%, fully stirring until the polymer is completely dissolved, filtering out insoluble substances by using a filter with the particle size of 0.45 mu m, spreading a film by adopting a tape casting method, spreading the film on a clean glass dish, shaking uniformly until no bubbles exist, then covering the film by using a slightly larger glass dish to prevent impurities from falling, placing the film in a glass box, gradually evaporating the solvent to dryness to form a film at room temperature, and taking down the film by using tweezers to obtain the polyimide film, wherein the thickness of the obtained polyimide film is 66 mu m.
The surface area is 579 g/square meter by the BET test, the gas separation test is carried out, the permeability coefficient of nitrogen is 53.80barrer, the permeability coefficient of oxygen is 156.65barrer, the permeability coefficient of hydrogen is 648.05barrer, the permeability coefficient of methane is 57.83barrer, the permeability coefficient of carbon dioxide is 763.4barrer, the permeability selectivity of carbon dioxide/methane is 13.20, the permeability selectivity of carbon dioxide/nitrogen is 14.19, the temperature of 5 percent of thermal weight loss under the nitrogen condition is 476 ℃, and the glass transition temperature is 455 ℃.
Example 3
In this embodiment, the polyimide has the structure of the formula;
the preparation of the polyimide gas separation membrane mainly comprises the following steps:
under the protection of nitrogen atmosphere, 0.8074g (1.12mmol) of 3,3',5,5' -tetra trifluoromethyl- [1,1':2', 1':2', 1' -tetraphenyl ] -4,4',5,5' -tetracarboxylic dianhydride and 0.2807g (1.12mmol) of 3, 9-diamino-4, 10-dimethyl-6H, 12H-5, 11-methylbenzene [ b, f ] [1,5] diazocine and 0.0850g (0.56mmol) of benzoic acid are put into a three-mouth polymerization bottle, then 4.49g of anhydrous m-cresol is added to make the solid content of the whole system 20 wt%, mechanical stirring is adjusted to about 200r/min, the system is heated to 80 ℃ and stirred for 2H to make the whole dissolved to form a relatively transparent pale yellow solution, the system is heated to 180 ℃ for thermal imidization after the solid is completely dissolved, reacting for about 10 hours to completely imidize the polyimide, adding 6.01g of m-cresol to reduce the solid content of the system to 10 wt%, closing and heating, reducing the temperature to 80 ℃, placing 300ml of methanol on a magnetic stirrer for stirring, slowly pouring the reaction solution into the methanol to obtain white filamentous fibrous solid, continuously placing the fibrous solid on the magnetic stirrer for stirring for 2 hours, filtering the filamentous object, placing the filamentous object on a Soxhlet extractor for Soxhlet extraction for 12 hours by using methanol so as to remove the residual m-cresol solvent in the polymer, and then drying the filamentous object in vacuum at 120 ℃ to obtain the polyimide with the structure.
Dissolving the polymer (0.5g) in chloroform (24.5ml) to prepare a solution with the solid content of 2%, fully stirring until the polymer is completely dissolved, filtering out insoluble substances by using a filter head with the thickness of 0.45 mu m, spreading a film by adopting a tape casting method, flatly spreading the film on a clean glass dish, shaking the film uniformly until no bubbles exist, then covering the film by using a slightly larger glass dish to prevent impurities from falling into the glass dish, putting the glass dish in a glass box, gradually evaporating the solvent to dryness at room temperature to form a film, and taking down the film by using tweezers to obtain the polyimide film, wherein the thickness of the obtained polyimide film is 69 mu m.
The surface area is 552 g/square meter by BET test, the permeability coefficient of nitrogen is 62.47barrer, the permeability coefficient of oxygen is 192.4barrer, the permeability coefficient of hydrogen is 559.3barrer, the permeability coefficient of methane is 72.67barrer, the permeability coefficient of carbon dioxide is 939.6barrer, the permeability selectivity of oxygen/nitrogen is 3.08, the permeability selectivity of carbon dioxide/nitrogen is 12.93, the temperature of 5% weight loss under nitrogen condition is 471 ℃, and the glass transition temperature is 451 ℃, which are measured under the conditions of 1barrer and 35 ℃.
Example 4
In this embodiment, the polyimide has the structure of the formula;
the preparation of the polyimide gas separation membrane mainly comprises the following steps:
under the protection of nitrogen atmosphere, 0.5049g (1.13mmol) of 2,2' -diphenyl-4, 4',5,5' diphenyl tetracarboxylic dianhydride, 0.3216g (1.13mmol) of 2, 6-diamino triptycene and 0.06091(0.57mmol) benzoic acid are put into a three-mouth polymerization bottle, then 3.31g of anhydrous m-cresol is added to enable the solid content of the whole system to be 20 wt%, mechanical stirring is adjusted to be about 200r/min, the system is heated to 80 ℃ and stirred for 2h to be completely dissolved to form a transparent light yellow solution, after the solid is completely dissolved, the system is heated to 180 ℃ for thermal imidization, reaction is carried out for about 10h to enable polyimide to be completely thermal imidized, 4.13g of m-cresol is added to enable the solid content of the system to be reduced to 10 wt%, heating is closed, the temperature is reduced to 80 ℃, 300ml of methanol is put on a magnetic stirrer to be stirred, the reaction solution is slowly poured into the methanol, obtaining white filamentous fibrous solid, continuously placing the white filamentous fibrous solid in a magnetic stirrer for stirring for 2h, filtering the filamentous object, placing the filamentous object in a Soxhlet extractor for Soxhlet extraction for 12h by methanol so as to remove residual m-cresol solvent in the polymer, and then drying the filamentous object in vacuum at 120 ℃ to obtain the polyimide with the structure.
Dissolving the polymer (0.5g) in chloroform (24.5ml) to prepare a solution with the solid content of 2%, fully stirring until the polymer is completely dissolved, filtering out insoluble substances by using a filter head with the thickness of 0.45 mu m, spreading a film by adopting a tape casting method, flatly spreading the film on a clean glass dish, shaking the film uniformly until no bubbles exist, then covering the film by using a slightly larger glass dish to prevent impurities from falling into the glass dish, putting the glass dish in a glass box, gradually evaporating the solvent to dryness at room temperature to form a film, and taking down the film by using tweezers to obtain the polyimide film, wherein the thickness of the obtained polyimide film is 68 mu m.
The surface area is 298 g/square meter by the BET test, the gas separation test is carried out, the permeability coefficient of nitrogen is 16.42barrer, the permeability coefficient of oxygen is 61.66barrer, the permeability coefficient of hydrogen is 306.75barrer, the permeability coefficient of methane is 21.21barrer, the permeability coefficient of carbon dioxide is 370.1barrer, the permeability selectivity of carbon dioxide/methane is 17.45, the permeability selectivity of carbon dioxide/nitrogen is 22.54, the temperature of 5 percent of weight loss under the nitrogen condition is 543 ℃, and the glass transition temperature is 458 ℃.
Example 5
In this embodiment, the polyimide has the structure of the formula;
the preparation of the polyimide gas separation membrane mainly comprises the following steps:
under the protection of nitrogen atmosphere, 0.8945g (1.69mmol) of 2,2 '-bis (2' -trifluoromethylphenyl) -4,4',5,5' -biphenyltetracarboxylic dianhydride, 0.4367g (1.69mmol) of 2, 6-diaminotriptycene and 0.0938(0.85mmol) of benzoic acid are put into a three-mouth polymerization bottle, then 5.32g of anhydrous m-cresol is added to enable the solid content of the whole system to be 20 wt%, mechanical stirring is adjusted to be about 200r/min, the system is heated to 80 ℃ and stirred for 12h to be completely dissolved to form a transparent light yellow solution, after the solid is completely dissolved, the system is heated to 180 ℃ for thermal imidization, the polyimide is completely thermally imidized for about 10h, 6.66g of m-cresol is added to enable the solid content of the system to be reduced to 10 wt%, heating is closed, the temperature is reduced to 80 ℃, 300ml of methanol is put on a magnetic stirrer to be stirred, slowly pouring the reaction solution into methanol to obtain white filamentous fibrous solid, continuously placing the white filamentous fibrous solid in a magnetic stirrer for stirring for 2h, filtering the filamentous objects, placing the filamentous objects in a Soxhlet extractor for Soxhlet extraction for 12h by using methanol so as to remove residual m-cresol solvent in the polymer, and then drying the filamentous objects in vacuum at 120 ℃ to obtain the polyimide with the structure.
Dissolving the above polymer (0.5g) in chloroform (25ml) to obtain a solution with a solid content of 2%, stirring thoroughly until it is completely dissolved, filtering out insoluble substances with a 0.45 μm filter head, spreading by tape casting, spreading on a clean glass dish, shaking uniformly until there is no bubble, covering with a slightly larger glass dish to prevent impurities from falling in, placing in a glass box, evaporating the solvent to dryness at room temperature to form a film, and removing with tweezers to obtain a polyimide film with a thickness of 72 μm.
The surface area is 530 g/square meter by BET test, the permeability coefficient of nitrogen is 42,3 barrers, the permeability coefficient of oxygen is 160.45 barrers, the permeability coefficient of hydrogen is 612.8 barrers, the permeability coefficient of methane is 56.02 barrers, the permeability coefficient of carbon dioxide is 837.2 barrers, the permeability selectivity of carbon dioxide/methane is 14.94, the permeability selectivity of carbon dioxide/nitrogen is 20.7, the temperature of 5% thermal weight loss under nitrogen condition is 555 ℃, and the glass transition temperature is 465 ℃ by gas separation test under the conditions of 1barrer and 35 ℃.
Example 6
In this embodiment, the polyimide has the following structure:
the preparation of the polyimide gas separation membrane mainly comprises the following steps:
under the protection of nitrogen atmosphere, 0.7243g (1.00mmol) of 3,3',5,5' -tetra trifluoromethyl- [1,1':2', 1':2', 1' -tetraphenyl ] -4,4',5,5' -tetracarboxylic dianhydride, 0.2867g (1.00mmol) of 2, 6-diamino triptycene and 0.0616(0.5mmol) of benzoic acid are put into a three-mouth polymerization bottle, then 4.04g of anhydrous m-cresol is added to make the solid content of the whole system be 20 wt%, mechanical stirring is adjusted to be about 200r/min, the system is heated to 80 ℃ and stirred for 2h to be completely dissolved to form a relatively transparent light yellow solution, after the solid is completely dissolved, the system is heated to 180 ℃ to be thermally imidized, the polyimide is completely thermally imidized after 10h reaction, 5.06g of m-cresol is added to make the solid content of the system be reduced to 10 wt%, and (2) closing heating, cooling to 80 ℃, placing 300ml of methanol on a magnetic stirrer for stirring, slowly pouring the reaction solution into the methanol to obtain white filamentous fibrous solid, continuously placing the white filamentous fibrous solid on the magnetic stirrer for stirring for 2 hours, filtering the filamentous object, placing the filamentous object on a Soxhlet extractor for Soxhlet extraction by the methanol for 12 hours so as to remove the residual m-cresol solvent in the polymer, and then drying the filamentous object under vacuum at 120 ℃ to obtain the polyimide with the structure.
Dissolving the polymer (0.5g) in chloroform (24.5ml) to prepare a solution with the solid content of 2%, fully stirring until the polymer is completely dissolved, filtering out insoluble substances by using a filter with the thickness of 0.45 mu m, spreading a film by adopting a tape casting method, spreading the film on a clean glass dish, shaking uniformly until no bubbles exist, then covering the film by using a slightly larger glass dish to prevent impurities from falling, placing the film in a glass box, gradually evaporating the solvent to dryness to form a film at room temperature, and taking down the film by using tweezers to obtain the polyimide film, wherein the thickness of the obtained polyimide film is 70 mu m.
The surface area is 479 g/square meter by BET test, the gas separation test is carried out, the permeability coefficient of nitrogen is 76.10barrer, the permeability coefficient of oxygen is 200.50barrer, the permeability coefficient of hydrogen is 619.80barrer, the permeability coefficient of methane is 93.64barrer, the permeability coefficient of carbon dioxide is 1008barrer, the permeability selectivity of carbon dioxide/methane is 10.77, the permeability selectivity of carbon dioxide/nitrogen is 13.24, the temperature of 5 percent of thermal weight loss under the nitrogen condition is 522 ℃, and the glass transition temperature is 455 ℃.
Some of the performance test methods used in the examples for the polymers are as follows:
(1) structural characterization:
the NMR spectra of the polymers in the examples were measured using a Brookfield NMR spectrometer;
the IR spectra of the polymers in the examples described were tested using a Fourier transform attenuated Total reflectance IR spectrometer.
(2) And (3) testing physical properties:
the specific surface area of the polymer in the examples was tested using a mack ASAP2640 fully automated specific surface and porosity analyzer and the resulting polymer was ground to a fine powder.
(3) Testing the gas separation performance:
fixing the obtained polyimide gas separation membrane on a testing instrument, and performing gas separation test by adopting a variable-pressure constant-volume method, wherein the test area is 0.77cm2The test was carried out at 1bar and 35 ℃.
As can be seen from the table below. The obtained polyimide gas separation membrane has higher permeability coefficient, relative selectivity is not greatly reduced, and the used examples 1-6 have higher permeability coefficient compared with the previously reported BPDA series polyimide gas separation membranes (refer to European Polymer Journal, 43(2007), 194-.
Gas separation test results:
the obtained polyimide separation membrane has higher gas permeability, keeps better selectivity while improving the permeability, and can be widely applied to gas separation.
In addition, the present invention is also more preferable in the results of the tests of the present invention with reference to the above examples, with respect to other raw materials, experimental conditions, process operations, and the like.
The above embodiments are preferred embodiments of the present invention, and it is obvious to those skilled in the art that the present invention may be modified in a few ways without departing from the principle and technical scope of the present invention, and all the additions and substitutions should be made within the scope of the present invention.
Claims (9)
1. A polyimide having a structure represented by the following formula (I):
wherein n represents the degree of polymerization, and n is a positive integer of 10-500;
r is selected from any one or more of the following structural groups:
R1any one selected from the following structural groups:
2. a preparation method of polyimide shown in a formula (I) is characterized by comprising the following steps:
(1) under the protection of inert gas, mixing the monomer A, the monomer B and a catalyst, adding a solvent to prepare a solution with the solid content of 10-20 wt%, stirring, and heating to 70-90 ℃ to react for 1-3 hours to obtain a polyamic acid solution;
(2) heating the system in the step (1) to 180-200 ℃, continuously reacting for 8-12 h to dehydrate the polyamic acid solution to form a polyimide solution, and supplementing a solvent to reduce the solid content of the system to 8-10 wt%;
(3) cooling the system in the step (2) to 60-80 ℃, pouring the cooled system into a precipitator under the stirring condition to obtain a filamentous polymer, and filtering, washing, purifying and drying the filamentous polymer to obtain polyimide shown in the formula (I);
in the preparation method, the monomer A is selected from any one or more of the following compounds:
the monomer B is selected from any one or more of the following compounds:
2, 8-diamino-4, 10-dimethyl-6H, 12H-5, 11-methylbenzyl [ b, f ] [1,5] diazocine, 3, 9-diamino-4, 10-dimethyl-6H, 12H-5, 11-methylbenzyl [ b, f ] [1,5] diazocine, 2, 6-diaminotriptycene, 2,4, 6-trimethylm-phenylenediamine, 2 '-bis (trimethyl) -4,4' -diaminobiphenyl, 2 '-diamino-3, 3' -dimethyl-9, 9 '-spirobifluorene, 6-amino-1- (4-aminophenyl) -1,3, 3-trimethylindene, 4' -diamino-3, 3' -dimethylbinaphthyl, 5,5' -diamino-3, 3,3',3' -tetramethyl-2, 2', 3,3' -tetrahydro-1, 1' -spirobis [ indene ], tetramethylp-phenylenediamine, 3,3',5,5' -tetramethylbenzidine, 1, 5-naphthalenediamine.
3. The method according to claim 1, wherein in the step (1), the molar ratio of the monomer A to the monomer B to the catalyst is 1: 1: 0.5.
4. the process according to claim 1, wherein in the step (1), the catalyst is selected from benzoic acid and/or p-hydroxybenzoic acid.
5. The method according to claim 1, wherein in the step (1) or (2), the solvent is one or more selected from the group consisting of m-cresol, N-dimethylformamide, N-dimethylacetamide and N-methylpyrrolidone.
6. The method according to claim 1, wherein in the step (3), the precipitating agent is one or more selected from methanol, ethanol and water.
7. Use of a polyimide of formula (I) in the preparation of a gas separation membrane.
8. The application of claim 7, characterized in that the method of applying is:
dissolving polyimide shown in a formula (I) in an organic solvent to prepare a solution with the mass fraction of 1-10%, then spreading a membrane by adopting a tape casting method, filtering the solution by using a filter head with the diameter of 0.45-1 mu m, pouring the solution on a clean glass dish or a glass plate to uniformly spread the solution, heating the solution by adopting a temperature programming method, drying the solution in vacuum at the temperature of 60-120 ℃ for 12-24 hours, and then demoulding to obtain the polyimide gas separation membrane.
9. The use according to claim 8, wherein the organic solvent is selected from any one or more of chloroform, dichloromethane, N-methylpyrrolidone, tetrahydrofuran, N-dimethylformamide, N-dimethylacetamide, acetone, m-cresol, and dimethylsulfoxide.
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| CN105968353A (en) * | 2016-05-26 | 2016-09-28 | 黑龙江省科学院高技术研究院 | Polyimide film prepared at low temperature and preparing method thereof |
| CN107913580A (en) * | 2017-11-15 | 2018-04-17 | 中国科学院长春应用化学研究所 | A kind of application of polyimides in gas separation |
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| CN105968353A (en) * | 2016-05-26 | 2016-09-28 | 黑龙江省科学院高技术研究院 | Polyimide film prepared at low temperature and preparing method thereof |
| CN107913580A (en) * | 2017-11-15 | 2018-04-17 | 中国科学院长春应用化学研究所 | A kind of application of polyimides in gas separation |
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| WO2022268146A1 (en) * | 2021-06-23 | 2022-12-29 | 中国石油化工股份有限公司 | Polyimide copolymer and film, preparation methods therefor and applications thereof, and system and method for purifying helium |
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