US20090269644A1 - Proton conducting materials - Google Patents

Proton conducting materials Download PDF

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US20090269644A1
US20090269644A1 US12/429,371 US42937109A US2009269644A1 US 20090269644 A1 US20090269644 A1 US 20090269644A1 US 42937109 A US42937109 A US 42937109A US 2009269644 A1 US2009269644 A1 US 2009269644A1
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polymer electrolyte
groups
group
substituted
compound according
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Steven J. Hamrock
Mark S. Schaberg
Neeraj Sharma
John E. Abulu
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3M Innovative Properties Co
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3M Innovative Properties Co
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Priority to US12/429,371 priority Critical patent/US20090269644A1/en
Assigned to 3M INNOVATIVE PROPERTIES COMPANY reassignment 3M INNOVATIVE PROPERTIES COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HAMROCK, STEVEN J., ABULU, JOHN E., SCHABERG, MARK S., SHARMA, NEERAJ
Publication of US20090269644A1 publication Critical patent/US20090269644A1/en
Priority to US13/269,907 priority patent/US8227140B2/en
Priority to US13/529,706 priority patent/US8481227B2/en
Priority to US13/912,768 priority patent/US9160021B2/en
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/10—Fuel cells with solid electrolytes
    • H01M8/1016—Fuel cells with solid electrolytes characterised by the electrolyte material
    • H01M8/1018—Polymeric electrolyte materials
    • H01M8/1039—Polymeric electrolyte materials halogenated, e.g. sulfonated polyvinylidene fluorides
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
    • C07F9/00—Compounds containing elements of Groups 5 or 15 of the Periodic Table
    • C07F9/02—Phosphorus compounds
    • C07F9/28—Phosphorus compounds with one or more P—C bonds
    • C07F9/38—Phosphonic acids [RP(=O)(OH)2]; Thiophosphonic acids ; [RP(=X1)(X2H)2(X1, X2 are each independently O, S or Se)]
    • C07F9/3804—Phosphonic acids [RP(=O)(OH)2]; Thiophosphonic acids ; [RP(=X1)(X2H)2(X1, X2 are each independently O, S or Se)] not used, see subgroups
    • C07F9/3834—Aromatic acids (P-C aromatic linkage)
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
    • C07F9/00—Compounds containing elements of Groups 5 or 15 of the Periodic Table
    • C07F9/02—Phosphorus compounds
    • C07F9/28—Phosphorus compounds with one or more P—C bonds
    • C07F9/38—Phosphonic acids [RP(=O)(OH)2]; Thiophosphonic acids ; [RP(=X1)(X2H)2(X1, X2 are each independently O, S or Se)]
    • C07F9/40—Esters thereof
    • C07F9/4003—Esters thereof the acid moiety containing a substituent or a structure which is considered as characteristic
    • C07F9/4021—Esters of aromatic acids (P-C aromatic linkage)
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F8/00—Chemical modification by after-treatment
    • C08F8/30—Introducing nitrogen atoms or nitrogen-containing groups
    • C08F8/32—Introducing nitrogen atoms or nitrogen-containing groups by reaction with amines
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F8/00—Chemical modification by after-treatment
    • C08F8/34—Introducing sulfur atoms or sulfur-containing groups
    • C08F8/36—Sulfonation; Sulfation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F8/00—Chemical modification by after-treatment
    • C08F8/40—Introducing phosphorus atoms or phosphorus-containing groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/20—Manufacture of shaped structures of ion-exchange resins
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/20—Manufacture of shaped structures of ion-exchange resins
    • C08J5/22—Films, membranes or diaphragms
    • C08J5/2206—Films, membranes or diaphragms based on organic and/or inorganic macromolecular compounds
    • C08J5/2218—Synthetic macromolecular compounds
    • C08J5/2231—Synthetic macromolecular compounds based on macromolecular compounds obtained by reactions involving unsaturated carbon-to-carbon bonds
    • C08J5/2237—Synthetic macromolecular compounds based on macromolecular compounds obtained by reactions involving unsaturated carbon-to-carbon bonds containing fluorine
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/20—Manufacture of shaped structures of ion-exchange resins
    • C08J5/22—Films, membranes or diaphragms
    • C08J5/2206—Films, membranes or diaphragms based on organic and/or inorganic macromolecular compounds
    • C08J5/2218—Synthetic macromolecular compounds
    • C08J5/2231—Synthetic macromolecular compounds based on macromolecular compounds obtained by reactions involving unsaturated carbon-to-carbon bonds
    • C08J5/2243—Synthetic macromolecular compounds based on macromolecular compounds obtained by reactions involving unsaturated carbon-to-carbon bonds obtained by introduction of active groups capable of ion-exchange into compounds of the type C08J5/2231
    • C08J5/225—Synthetic macromolecular compounds based on macromolecular compounds obtained by reactions involving unsaturated carbon-to-carbon bonds obtained by introduction of active groups capable of ion-exchange into compounds of the type C08J5/2231 containing fluorine
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/10—Fuel cells with solid electrolytes
    • H01M8/1016—Fuel cells with solid electrolytes characterised by the electrolyte material
    • H01M8/1018—Polymeric electrolyte materials
    • H01M8/102—Polymeric electrolyte materials characterised by the chemical structure of the main chain of the ion-conducting polymer
    • H01M8/1023—Polymeric electrolyte materials characterised by the chemical structure of the main chain of the ion-conducting polymer having only carbon, e.g. polyarylenes, polystyrenes or polybutadiene-styrenes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/10—Fuel cells with solid electrolytes
    • H01M8/1016—Fuel cells with solid electrolytes characterised by the electrolyte material
    • H01M8/1018—Polymeric electrolyte materials
    • H01M8/1041—Polymer electrolyte composites, mixtures or blends
    • H01M8/1046—Mixtures of at least one polymer and at least one additive
    • H01M8/1051—Non-ion-conducting additives, e.g. stabilisers, SiO2 or ZrO2
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
    • C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
    • C08J2327/12—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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

  • This disclosure relates to materials that may be useful as ionomers or polymer ionomers.
  • each R 1 is independently chosen from the group consisting of hydrogen, alkyl, alkylene or aryl groups which may contain heteroatoms and which may be substituted, polymers, metals, metal oxides, metal phosphates, metal phosphonates and inorganic particles, wherein m is 0 or 1, wherein Ar is an aromatic group which may include heterocycles and polycycles and may be substituted, and wherein R 2 is chosen from the group consisting of alkyl, alkylene or aryl groups which may contain heteroatoms and which may be substituted, and polymers.
  • Ar is phenylene.
  • Ar is phenylene-R 3 , wherein R 3 is chosen from the group consisting of hydrogen, alkyl, alkylene or aryl groups which may contain heteroatoms and which may be substituted, and polymers.
  • R 2 is a fluoropolymer.
  • R 2 is substituted with one or more acid groups selected from the group consisting of sulfonic acid groups and phosphonic acid groups.
  • R 1 is chosen from the group consisting of metals, metal oxides, metal phosphates, metal phosphonates and inorganic particles, wherein m is 0 or 1, wherein Ar is an aromatic group which may include heterocycles and polycycles and may be substituted, and wherein R 2 is chosen from the group consisting of alkyl, alkylene or aryl groups which may contain heteroatoms and which may be substituted, and polymers.
  • Ar is phenylene.
  • Ar is phenylene-R 3 , wherein R 3 is chosen from the group consisting of hydrogen, alkyl, alkylene or aryl groups which may contain heteroatoms and which may be substituted, and polymers.
  • R 2 is a fluoropolymer. In some embodiments, R 2 is substituted with one or more acid groups selected from the group consisting of sulfonic acid groups and phosphonic acid groups. In some embodiments, one or more or every R 1 is a metal or metal oxide wherein the metal is selected from the group consisting of Zr, Ti, Th and Sn. In some embodiments, one or more or every R 1 is a metal or metal oxide wherein the metal is selected from the group consisting of tetravalent metals.
  • each R 1 is independently chosen from the group consisting of hydrogen, alkyl, alkylene or aryl groups which may contain heteroatoms and which may be substituted, polymers, metals, metal oxides, metal phosphates, metal phosphonates and inorganic particles, wherein n is 1, 2 or 3, wherein Ar is an aromatic group which may include heterocycles and polycycles and may be substituted, and wherein R 2 is chosen from the group consisting of alkyl, alkylene or aryl groups which may contain heteroatoms and which may be substituted, and polymers.
  • Ar is phenylene.
  • Ar is phenylene-R 3 , wherein R 3 is chosen from the group consisting of hydrogen, alkyl, alkylene or aryl groups which may contain heteroatoms and which may be substituted, and polymers.
  • R 2 is a fluoropolymer.
  • R 2 is substituted with one or more acid groups selected from the group consisting of sulfonic acid groups and phosphonic acid groups.
  • polymer electrolytes comprising a highly fluorinated backbone and first pendant groups which comprise groups according to the formula:
  • Ar is an aromatic group of 5-24 carbon atoms which may include heterocycles and polycycles and may be substituted, where A is selected from the group consisting of —SO 3 H and —PO 3 H 2 , where n is between 1 and q, where q is one-half the number of carbons in Ar.
  • the polymer electrolyte comprises a perfluorinated backbone.
  • the polymer electrolyte comprises second pendant groups which comprise groups according to the formula: —SO 3 H.
  • the ratio of first to second pendant groups is p, where p is between 0.01 and 100, between 0.1 and 10, between 0.1 and 1 or between 1 and 10.
  • the present disclosure provides polymer electrolyte membranes or membrane electrode assemblies comprising the present polymer electrolytes, which may additionally comprising a porous support or may additionally be crosslinked.
  • equivalent weight (or “EW”) of a polymer means the weight of polymer which will neutralize one equivalent of base (allowing that, where sulfonyl halide substituents or other substituents that would be converted into acidic functions during use of the polymer in a fuel cell are present, “equivalent weight” refers to the equivalent weight after hydrolyzation of such groups);
  • “highly fluorinated” means containing fluorine in an amount of 40 wt % or more, typically 50 wt % or more and more typically 60 wt % or more;
  • substituted means, for a chemical species, substituted by conventional substituents which do not interfere with the desired product or process, e.g., substituents can be alkyl, alkoxy, aryl, phenyl, halo (F, Cl, Br, I), cyano, nitro, etc.
  • This disclosure relates to production of materials, including polymers, particles and small molecules, linked to acid-containing through the covalent bonding of materials using sulfonamide, bis sulfonyl imide and phosphonic linkages.
  • this disclosure concerns fuel cell membrane materials with an increased number of strong acid groups created in some embodiments by reaction of these acid containing molecules with acid containing organic molecules, metal oxide or phosphate particles, metal salts, heteropolyacids, and the like.
  • Another aspect of this disclosure involves the use of these multifunctional materials to develop crosslinked structures for improved mechanical properties or to minimize component leaching.
  • Materials taught in this disclosure may be used for fuel cell applications such as in the manufacture of proton exchange membranes (PEM), as catalyst additives or in tie layers designed to be thermally and chemically robust while operating within a fuel cell's harsh environment at higher temperatures and to conduct protons, with significantly higher levels of bound acidic groups, while in a low hydration state.
  • PEM proton exchange membranes
  • This disclosure describes the modification of PFSA's or other polymers by the conversion of the sulfonic acid group to a bis sulfonyl imide group with an aromatic group which can be further modified by the attachment of additional acid groups (for improved conductivity) or phosphonic acid groups or silane groups (for attachment of heteropolyacids, for the attachment of inorganic particles such as zirconia or zirconyl phosphate or for the attachment of silica particles).
  • Crosslinking may be accomplished thru the use of difunctional reactants. Examples include but are not limited to: ammonia, benzene disulfonyl chloride, naphthalene disulfonyl chloride sulfonic acid sodium salt, bis-(phenyldisulfonyl anhydride) and disulfonamides (e.g. benzene disulfonamide).
  • Useful reactive groups include halides, sulfonyl halides, disulfonyl anhydrides, sulfonamides, amines, phosphonic diols, acids and esters, Tungstenic diols, and the like.
  • Aromatic groups may be sulfonated by any suitable method. Aromatic groups may be sulfonated by use of Na 2 SO 3 , chlorosulfonic acid, trimethyl silyl sulfonic acid, sulfuric acid, or other sulfonating agents.
  • This disclosure further describes the attachment of small molecules containing bis sulfonyl imides to inorganic moieties such as HPA's or particles and methods of synthesizing these compounds.
  • Polymers according to the present disclosure may be crosslinked by any suitable method, which may include methods disclosed in U.S. Pat. No. 7,179,847, issued Feb. 20, 2007; U.S. Pat. No. 7,514,481, issued Apr. 7, 2009; U.S. Pat. No. 7,265,162, issued Sep. 4, 2007; U.S. Pat. No. 7,074,841, issued Jul. 11, 2006; U.S. Pat. No. 7,435,498, issued Oct. 14, 2008; U.S. Pat. No. 7,259,208, issued Aug. 21, 2007; U.S. Pat. No. 7,411,022, issued Aug. 12, 2008; U.S. Pat. No. 7,060,756, issued Jun. 13, 2006; U.S. Pat. No.
  • a sulfonamide functional polymer was created by reacting a polymer having pendent sulfonyl fluoride groups with ammonia followed by ion exchange, as diagrammed below. As indicated, a side reaction can occur involving formation of imide crosslinks by the reaction of the sulfonamide with a second —SO 2 F group.
  • the polymer used was a copolymer of tetrafluoroethylene (TFE) and FSO 2 —CF 2 CF 2 CF 2 CF 2 —O—CF ⁇ CF 2 , described in U.S. patent applications Ser. Nos. 10/322,254, 10/322,226 and 10/325,278, which are incorporated herein by reference.
  • About 23 g of a 90/10 blend of a ⁇ 680 EW polymer and an 800 EW polymer was placed into a 600 ml Parr bomb with 150 g acetonitrile. The bomb was sealed up, evacuated and with low agitation chilled to ⁇ 20 C. Ammonia was added to 40 psig and the temperature keep below 5 C for 6 hours. It was then allowed to warm up to room temperature overnight.
  • the vessel was opened and the grey solid polymer separated and dissolved in 108 g of methanol and 20 g of DI water with modest warming.
  • the solution was then exposed to acidified and rinsed Amberlite IR-120 ion exchange beads a total of 6 times to drop the solution pH containing polymer to ⁇ 3.
  • An NMR spectrum of the lower pH solution shows a substantial sulfonamide peak at ⁇ 115.0 with a small sulfonic acid peak at ⁇ 115.7, with a peak integration ratio of 12 to 1.
  • the solution was dried at 60 C, overnight, resulting in 12.1 g of light yellow solid.
  • the polymer was then redissolved in acetonitrile, allowed to stand and settle. The dissolved portion was again coated out and dried, resulting in 8.7 g of slightly yellow, slightly cloudy, rigid film.
  • Step 1 23.6 gm of 4-Bromobenzenesulfonamide was added to 100 ml of dry Acetonitrile in a three-necked round bottom flask. The flask was cooled to 0° C. and a water cooled reflux condenser was attached to the center neck of the flask. The flask was continuously purged with Nitrogen during the course of the reaction. 30.3 gm of Triethylamine was added to the flask under stirring. 25.6 gm of 4-Bromobenzenesulfonylchloride was weighed in a Nitrogen purged box and added in portions to the flask under constant stirring.
  • Step 2 An oven dried flask was cooled under nitrogen and charged with 1 gm of product from step 1, palladium(II) acetate (8 mg) and triphenylphosphine (30 mg). 15 ml of Ethanol was introduced into the flask through a needle and syringe followed by dropwise addition of N,N-dicyclohexylmethylamine (1.25 ml) and diethyl phosphite (0.61 ml). The reaction mixture was refluxed for 15 hours at 80° C. The solvent was removed in a rotary evaporator to obtain the product as triethyl amine salt—a brown semisolid in 80% yield. The phosphonation was confirmed by 31 P NMR signal at ⁇ 16.74 ppm (referenced to H 3 PO 4 ).
  • Step 3 1 g of step 2 product was refluxed with 20 ml of 12N HCl for 36 hours to hydrolyze the phosphonate ester. The resulting mixture was dried using a rotary evaporated to yield the hydrolyzed phosphonic acid product. The completion of the hydrolysis of the diethylphosphonate ester was confirmed by the absence of the ethyl signals at 3.99 ppm, 1.22 ppm in the final product and by the 31 P NMR: ⁇ 12.06 ppm (referenced to H 3 PO 4 ).
  • Example 5 The phosphonic acid synthesized in Example 5 is attached to a lacunary heteropolyacid, such as described in U.S. patent application Ser. No. 12/266,932, filed Nov. 7, 2008, (the disclosure of which is incorporated herein by reference), by reacting the phosphonic acids with a lacunary heteropolyacid salt by the method described in Example 6.
  • a lacunary heteropolyacid such as described in U.S. patent application Ser. No. 12/266,932, filed Nov. 7, 2008, (the disclosure of which is incorporated herein by reference)
  • Example 8 The reaction described in Example 8 was carried out using 2 g of 3,5-difluorobenzenesulfonyl chloride (from Alfa Aesar, Ward Hill, Mass., USA) and 10 g of polymer at 10% solids in 45 ml of acetonitrile.
  • the polymers obtained in Examples 8 and 9 are sulfonated by reaction with Na 2 SO 3 to obtain acidic polymers with pendent disulfonated aromatic groups bound via sulfonyl imide functions.
  • the polymers obtained in Examples 10 and 11 are sulfonated by to obtain acidic polymers with pendent disulfonated aromatic groups bound via sulfonyl imide functions.
  • the polymers so obtained are further sulfonated to obtain acidic polymers with pendent polysulfonated aromatic groups bound via sulfonyl imide functions.
  • Proton conductivity was measured using a standard, in-plane, 4 point probe conductivity apparatus with platinum electrodes, commercially available form Bekktech Inc., Loveland Colo.
  • the cell was electrically connected to a potentiostat (Model 273, Princeton Applied Research) and an Impedance/Gain Phase Analyzer (SI 1260, Schlumberger). AC impedance measurements was performed using Zplot and Zview software (Scribner Associates). Temperature and relative humidity were controlled with a constant humidity oven (TestEquity Model 1000H).
  • Conductivity was measured for the polymer of Example 10, the polymer of Example 11 and a polymer of about 800 EW essentially similar to the precursor polymer used to make the polymers of Examples 10 and 11. Thus all three polymers would be expected to have similar backbone crystallinity, had the polymer backbone of a polymer with an EW of about 800, however, the polymers of Examples 10 and 11 expected to have an EW of about 550 (by calculation). Conductivity was also measured for a similar polymer of about 650 EW. The polymers of Examples 10 and 11 showed improved conductivity at relative humidities of 50% or above. At relative humidities of 65% or higher, the polymers of Examples 10 and 11 demonstrated conductivity comparable to the 650 EW polymer.
  • the polymers of Examples 10 and 11 demonstrated conductivity comparable to the 800 EW polymer. At a relative humidity of 5o%, the polymers of Examples 10 and 11 demonstrated conductivity intermediate between the 650 EW and 800 EW polymers.

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US12/429,371 US20090269644A1 (en) 2008-04-24 2009-04-24 Proton conducting materials
US13/269,907 US8227140B2 (en) 2008-04-24 2011-10-10 Proton conducting materials
US13/529,706 US8481227B2 (en) 2008-04-24 2012-06-21 Proton conducting materials
US13/912,768 US9160021B2 (en) 2008-04-24 2013-06-07 Proton conducting materials

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012096653A1 (en) * 2011-01-11 2012-07-19 Utc Power Corporation Proton exchange material and method therefor
US20130029249A1 (en) * 2010-04-16 2013-01-31 3M Innovative Properties Company Proton conducting materials
US8481227B2 (en) 2008-04-24 2013-07-09 3M Innovative Properties Company Proton conducting materials
WO2013162499A1 (en) * 2012-04-23 2013-10-31 United Technologies Corporation Method for dispersing particles in perfluorinated polymer ionomer
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