WO2005052040A1 - Polymer electrolyte membranes crosslinked by nitrile trimerization - Google Patents
Polymer electrolyte membranes crosslinked by nitrile trimerization Download PDFInfo
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- WO2005052040A1 WO2005052040A1 PCT/US2004/033808 US2004033808W WO2005052040A1 WO 2005052040 A1 WO2005052040 A1 WO 2005052040A1 US 2004033808 W US2004033808 W US 2004033808W WO 2005052040 A1 WO2005052040 A1 WO 2005052040A1
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- 239000012528 membrane Substances 0.000 title claims abstract description 35
- 239000005518 polymer electrolyte Substances 0.000 title claims abstract description 16
- 238000005829 trimerization reaction Methods 0.000 title abstract description 7
- 150000002825 nitriles Chemical class 0.000 title description 7
- 229920000642 polymer Polymers 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 16
- 229920002313 fluoropolymer Polymers 0.000 claims abstract description 13
- UJMWVICAENGCRF-UHFFFAOYSA-N oxygen difluoride Chemical group FOF UJMWVICAENGCRF-UHFFFAOYSA-N 0.000 claims abstract description 11
- 125000005010 perfluoroalkyl group Chemical group 0.000 claims abstract description 10
- 125000002560 nitrile group Chemical group 0.000 claims abstract description 9
- 125000004430 oxygen atom Chemical group O* 0.000 claims abstract description 9
- 229910006069 SO3H Inorganic materials 0.000 claims abstract description 8
- 125000004432 carbon atom Chemical group C* 0.000 claims abstract description 8
- 125000000542 sulfonic acid group Chemical group 0.000 claims abstract description 6
- 229910006080 SO2X Inorganic materials 0.000 claims description 15
- 239000004811 fluoropolymer Substances 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 229910052794 bromium Inorganic materials 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 125000002128 sulfonyl halide group Chemical group 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 229910052731 fluorine Inorganic materials 0.000 claims description 3
- 229910052736 halogen Inorganic materials 0.000 claims description 3
- 229920005597 polymer membrane Polymers 0.000 claims description 3
- 150000001768 cations Chemical class 0.000 claims 2
- 229910052801 chlorine Inorganic materials 0.000 claims 2
- 125000005843 halogen group Chemical group 0.000 claims 1
- 239000000446 fuel Substances 0.000 abstract description 10
- 229920006037 cross link polymer Polymers 0.000 abstract description 6
- 125000000020 sulfo group Chemical group O=S(=O)([*])O[H] 0.000 abstract 1
- 238000004132 cross linking Methods 0.000 description 9
- 238000006116 polymerization reaction Methods 0.000 description 8
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 8
- 239000003054 catalyst Substances 0.000 description 7
- 239000000178 monomer Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 239000011159 matrix material Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- JYEUMXHLPRZUAT-UHFFFAOYSA-N 1,2,3-triazine Chemical group C1=CN=NN=C1 JYEUMXHLPRZUAT-UHFFFAOYSA-N 0.000 description 2
- GQHTUMJGOHRCHB-UHFFFAOYSA-N 2,3,4,6,7,8,9,10-octahydropyrimido[1,2-a]azepine Chemical compound C1CCCCN2CCCN=C21 GQHTUMJGOHRCHB-UHFFFAOYSA-N 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 229920006169 Perfluoroelastomer Polymers 0.000 description 2
- 229910006095 SO2F Inorganic materials 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 125000003118 aryl group Chemical group 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 150000002367 halogens Chemical group 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 239000003999 initiator Substances 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229920001897 terpolymer Polymers 0.000 description 2
- RRZIJNVZMJUGTK-UHFFFAOYSA-N 1,1,2-trifluoro-2-(1,2,2-trifluoroethenoxy)ethene Chemical compound FC(F)=C(F)OC(F)=C(F)F RRZIJNVZMJUGTK-UHFFFAOYSA-N 0.000 description 1
- MHNPWFZIRJMRKC-UHFFFAOYSA-N 1,1,2-trifluoroethene Chemical compound F[C]=C(F)F MHNPWFZIRJMRKC-UHFFFAOYSA-N 0.000 description 1
- BQCIDUSAKPWEOX-UHFFFAOYSA-N 1,1-Difluoroethene Chemical compound FC(F)=C BQCIDUSAKPWEOX-UHFFFAOYSA-N 0.000 description 1
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical class [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 239000002841 Lewis acid Chemical class 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- QYKIQEUNHZKYBP-UHFFFAOYSA-N Vinyl ether Chemical compound C=COC=C QYKIQEUNHZKYBP-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 150000003868 ammonium compounds Chemical class 0.000 description 1
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 1
- 239000012935 ammoniumperoxodisulfate Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000007900 aqueous suspension Substances 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- YOALFLHFSFEMLP-UHFFFAOYSA-N azane;2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-pentadecafluorooctanoic acid Chemical compound [NH4+].[O-]C(=O)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F YOALFLHFSFEMLP-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 125000001246 bromo group Chemical group Br* 0.000 description 1
- 150000007942 carboxylates Chemical class 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 150000001923 cyclic compounds Chemical class 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229920001973 fluoroelastomer Polymers 0.000 description 1
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 150000004820 halides Chemical group 0.000 description 1
- HCDGVLDPFQMKDK-UHFFFAOYSA-N hexafluoropropylene Chemical group FC(F)=C(F)C(F)(F)F HCDGVLDPFQMKDK-UHFFFAOYSA-N 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 239000011630 iodine Substances 0.000 description 1
- 239000003014 ion exchange membrane Substances 0.000 description 1
- 150000007517 lewis acids Chemical class 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 125000005062 perfluorophenyl group Chemical group FC1=C(C(=C(C(=C1F)F)F)F)* 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 150000003856 quaternary ammonium compounds Chemical class 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- HRZFUMHJMZEROT-UHFFFAOYSA-L sodium disulfite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])(=O)=O HRZFUMHJMZEROT-UHFFFAOYSA-L 0.000 description 1
- 235000010262 sodium metabisulphite Nutrition 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 150000003461 sulfonyl halides Chemical class 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000010557 suspension polymerization reaction Methods 0.000 description 1
- 238000010345 tape casting Methods 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
- C08F14/00—Homopolymers and 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
- C08F14/18—Monomers containing fluorine
- C08F14/20—Vinyl fluoride
-
- 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
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
-
- 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 invention relates to a method of making a crosslinked polymer electrolyte, typically in the form of a membrane for use as a polymer electrolyte membrane in an electrolytic cell such as a fuel cell, by trimerization of nitrile groups contained on groups pendant from the polymer.
- Patent No. 5,527,861 purportedly discloses nitrile containing perfluoroelastomers cured by a combination of a peroxide, a coagent, and a catalyst which causes crosslinks to form using the nitrile groups.
- the present invention provides a polymer electrolyte membrane comprising a highly fluorinated polymer comprising: a perfluorinated backbone, first pendent groups which comprise sulfonic acid groups, and crosslinks comprising rivalent groups according to the formula:
- [lie first pendent groups are typically according to the formula: -RI-SO3H, where R! s a branched or unbranched perfluoroalkyl or perfluoroether group comprising 1-15 ;arbon atoms and 0-4 oxygen atoms, most typically -O-CF2-CF2-CF2-CF2-SO3H or
- the present invention provides a method of making a polymer jlectrolyte membrane comprising the steps of: a) providing a highly fluorinated ) ⁇ lymer comprising: a perfluorinated backbone, first pendent groups which comprise lfonyl halide groups, and second pendent groups which comprise nitrile groups; b) rming the fluoropolymer into a membrane; c) forming crosslinks by trimerization of he nitrile groups; and d) converting the sulfonyl halide groups to sulfonic acid groups.
- [Tie second pendent groups are typically according to the formula: -CsN or -R *-G ⁇ N, vhere R* 1 is a branched or unbranched perfluoroalkyl or perfluoroether group ;omprising 1-15 carbon atoms and 0-4 oxygen atoms.
- the first pendent groups ypically according to the formula: -RI-SO2X, where X is a halogen and where R!
- the present invention provides crosslinked polymers made according to any of the methods of the present invention.
- EW equivalent weight
- HP hydrolysis product
- the present invention provides a crosslinked polymer electrolyte membrane, rhe membrane is derived from a polymer comprising: a highly fluorinated backbone, ⁇ rst pendent groups which include a group according to the formula -SO2X, where X is
- halogen and second pendent groups which include a nitrile group (-C ⁇ N) which may )e trimerized to form crosslinks comprising trivalent groups according to the formula:
- PEM's crosslinked polymer electrolyte membranes
- electrolytic ;ells such as fuel cells.
- PEM's manufactured from the crosslinked polymer according to the present nvention may be used in the fabrication of membrane electrode assemblies (MEA's) or use in fuel cells.
- MEA membrane electrode assemblies
- An ME A is the central element of a proton exchange membrane uel cell, such as a hydrogen fuel cell.
- Fuel cells are electrochemical cells which nroduce usable electricity by the catalyzed combination of a fuel such as hydrogen and in oxidant such as oxygen.
- Typical MEA's comprise a polymer electrolyte membrane PEM) (also known as an ion conductive membrane (ICM)), which functions as a solid slectrolyte.
- PEM polymer electrolyte membrane
- ICM ion conductive membrane
- Each electrode layer includes lectrochemical catalysts, typically including platinum metal.
- Gas diffusion layers 3DL's facilitate gas transport to and from the anode and cathode electrode materials nd conduct electrical current.
- the GDL may also be called a fluid transport layer FTL) or a diffuser/current collector (DCC).
- the anode and cathode electrode layers lay be applied to GDL's in the form of a catalyst ink, and the resulting coated GDL's andwiched with a PEM to form a five-layer MEA.
- the anode and cathode lectrode layers maybe applied to opposite sides of the PEM in the form of a catalyst tik, and the resulting catalyst-coated membrane (CCM) sandwiched with two GDL's to brm a five-layer MEA.
- the five layers of a five-layer MEA are, in order: anode GDL, node electrode layer, PEM, cathode electrode layer, and cathode GDL.
- protons are formed at the anode via hydrogen oxidation and transported tcross the PEM to the cathode to react with oxygen, causing electrical current to flow in tn external circuit connecting the electrodes.
- the PEM forms a durable, non-porous, ilectrically non-conductive mechanical barrier between the reactant gases, yet it also
- the polymer to be crosslinked comprises a backbone, which may be branched )r unbranched but is typically unbranched.
- the backbone is highly fluorinated and nore typically perfluorinated.
- the backbone may comprise units derived from :etrafluoroethylene (TFE), i.e., typically -CF2-CF2- units, and units derived from
- first side groups R may be added to the backbone by grafting.
- first side groups R are highly fluorinated and more typically perfluorinated.
- R may be aromatic or non-aromatic.
- R is
- Rl is a branched or unbranched perfluoroalkyl or perfluoroether group comprising 1-15 carbon atoms and 0-4 oxygen atoms
- R! is typically -O-R ⁇ - wherein R ⁇ is a branched or unbranched perfluoroalkyl or perfluoroether group comprising 1-15 carbon atoms and 0-4 oxygen atoms.
- R* is more typically -O-R-3- wherein R ⁇ is a perfluoroalkyl group comprising 1-15 carbon atoms. Examples of R!
- n 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 or 15 (-CF 2 CF(CF 3 )-) n where n is 1, 2, 3, 4, or 5 (-CF(CF 3 )CF2-) n where n is 1, 2, 3, 4, or 5(-CF2CF(CF3)-) n -CF2- where n is 1, 2, 3 or 4 (-O-CF2CF2-) n where n is 1, 2, 3, 4, 5, 6 or 7 (-O-CF2CF2CF 2 -) n where n is 1, 2, 3, 4, or 5 (-O-CF2CF2CF 2 CF2-) n where n is 1, 2 or 3 (-O-CF 2 CF(CF 3 )-) n where n is 1, 2, 3, 4, or 5 (-O-CF2CF(CF 2 CF3)-) n where n is 1, 2 or 3 (-O-CF(CF 3 )CF 2 -) n where n is 1, 2, 3, 4, or 5 (-O-CF2CF(CF 2 CF
- the -SO2X group is most ypically -SO2F during polymerization, i.e., X is F.
- the -SO2X group is typically ;onverted to -SO3H at some point prior to use of the fluoropolymer as an polymer slectrolyte.
- the fluoromonomer providing first side group R may be synthesized by any suitable means, including methods disclosed in U.S. Pat. No. 6,624,328.
- the fluoropolymer includes second pendant groups Q containing a CsN group.
- second pendent group which includes a group according to the formula -C ⁇ N.
- second pendant groups Q may be added to the backbone by [rafting.
- second pendant groups Q are highly fluorinated and more typically lerfluorinated, other than at the bromine position.
- Q is -R 1 !-C ⁇ N, where i.11 can be any Rl described above but is selected independently from R! .
- the polymer to be crosslinked may be made by any suitable method, including mulsion polymerization, extrusion polymerization, polymerization in supercritical :arbon dioxide, solution or suspension polymerization, and the like.
- An oxygen-free polymerization kettle equipped with an impeller agitator system is charged with deionized water and heated to 50°C and then the preemulsion is diarged into the polymerization kettle.
- the kettle is charged with a nitrile-functional nonomer such as typically in a preemulsion.
- the kettle is further charged with gaseous tetrafluoroethylene (TFE) to 6-8 bar absolute reaction Dressure.
- TFE gaseous tetrafluoroethylene
- agitator speed polymerization is initiated by addition of sodium disulfite and ammonium peroxodisulfate.
- the • eaction temperature is maintained at 50 °C.
- Reaction pressure is maintained at 6-8 bar ibsolute by feeding additional TFE into the gas phase.
- a second portion of MV4S preemulsion may be continuously fed into the liquid phase during the course of the reaction.
- Additional nitrile-functional monomer may also be continuously fed into the reactor during the course of the reaction.
- the monomer feed may be interrupted and the continuing polymerization allowed to reduce the pressure of the monomer gas phase.
- the reactor may then be vented and flushed with nitrogen gas.
- the polymer is formed into a membrane prior to crosslinking. Any suitable method of forming the membrane may be used.
- the polymer is typically cast from a suspension. Any suitable casting method may be used, including bar coating, ipray coating, slit coating, brush coating, and the like.
- the membrane may )e formed from neat polymer in a melt process such as extrusion. After forming, the nembrane may be annealed. Typically the membrane has a thickness of 90 microns or ess, more typically 60 microns or less, and most typically 30 microns or less. A thinner nembrane may provide less resistance to the passage of ions. In fuel cell use, this • esults in cooler operation and greater output of usable energy. Thinner membranes nust be made of materials that maintain their structural integrity in use.
- membranes are cast by knife coating out of a water suspension containing 20% solids onto a glass plate and dried at 80 °C for 10 minutes to form films having a hickness of approximately 30 microns.
- the step of crosslinking may be accomplished by any suitable method. Typically, crosslinking is accomplished by application of heat, ypically to a temperature of 160 °C or more, in the presence of suitable initiators or catalysts.
- Suitable initiators or catalysts may include ammonia, ammonium compounds, including salts of ammonium and salts of quaternary ammonium compounds, including cyclic compounds such as salts of l,8-diazabicyclo[5.4.0]undec- 7-ene (DBU), including salts of fluorinated carboxylates, Lewis acids, and the like.
- the step of crosslinking the polymer may occur in whole or part during annealing of the membrane or may be carried out separate from any annealing step. During the crosslinking step, nitrile groups trimerize to form linkages comprising triazine groups, i.e., trivalent groups according to the formula:
- the sulfur-containing functions of the first pendant groups may be converted to sulfonic acid form by any suitable process.
- Sulfonyl halide groups may be converted by hydrolysis.
- the polymer is immersed in an aqueous solution of a strong base and subsequently acidified.
- a polymer membrane is immersed in 15% KOH in water at 80 °C for 1 hour, then washed twice in 20% nitric acid at 80 °C, then boiled in deionized water twice.
- the acid-functional pendent groups typically are present in an amount sufficient 3 result in an hydration product (HP) of greater than 15,000, more typically greater an 18,000, more typically greater than 22,000, and most typically greater than 25,000. n general, higher HP correlates with higher ionic conductance.
- HP hydration product
- the acid-functional pendent groups typically are present in an amount sufficient 3 result in an equivalent weight (EW) of less than 1200, more typically less than 1100, nd more typically less than 1000, and more typically less than 900.
- the polymer may be imbibed into a porous supporting tiatrix prior to crosslinking, typically in the form of a thin membrane having a hickness of 90 microns or less, more typically 60 microns or less, and most typically 30 microns or less.
- a porous supporting tiatrix typically in the form of a thin membrane having a hickness of 90 microns or less, more typically 60 microns or less, and most typically 30 microns or less.
- Any suitable method of imbibing the polymer into the pores of the lUpporting matrix may be used, including overpressure, vacuum, wicking, immersion, md the like.
- the blend becomes embedded in the matrix upon crosslinking.
- Any suitable supporting matrix may be used.
- the supporting matrix is electrically ion-conductive.
- the supporting matrix is composed of a fluoropolymer, vhich is more typically perfluorinated.
- Typical matrices include porous )olytetrafluoroethylene (PTFE), such as biaxially stretched PTFE webs.
- PTFE porous )olytetrafluoroethylene
- polymers and membranes made according to the nethod of the present invention may differ in chemical structure from those made by 3ther methods, in the structure of crosslinks, the placement of crosslinks, the placement 3f acid-functional groups, the presence or absence of crosslinks on pendent groups or of icid-functional groups on crosslinks, and the like.
- This invention is useful in the manufacture of strengthened polymer electrolyte membranes for use in electrolytic cells such as fuel cells.
- electrolytic cells such as fuel cells.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002545173A CA2545173A1 (en) | 2003-11-13 | 2004-10-13 | Polymer electrolyte membranes crosslinked by nitrile trimerization |
JP2006539506A JP2007513219A (en) | 2003-11-13 | 2004-10-13 | Polymer electrolyte membranes crosslinked by nitrile trimerization |
EP04795027A EP1694751A1 (en) | 2003-11-13 | 2004-10-13 | Polymer electrolyte membranes crosslinked by nitrile trimerization |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US10/712,589 US7074841B2 (en) | 2003-11-13 | 2003-11-13 | Polymer electrolyte membranes crosslinked by nitrile trimerization |
US10/712,589 | 2003-11-13 |
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WO2005052040A1 true WO2005052040A1 (en) | 2005-06-09 |
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PCT/US2004/033808 WO2005052040A1 (en) | 2003-11-13 | 2004-10-13 | Polymer electrolyte membranes crosslinked by nitrile trimerization |
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US (2) | US7074841B2 (en) |
EP (1) | EP1694751A1 (en) |
JP (1) | JP2007513219A (en) |
KR (1) | KR20060107779A (en) |
CN (1) | CN1882642A (en) |
CA (1) | CA2545173A1 (en) |
TW (1) | TW200524961A (en) |
WO (1) | WO2005052040A1 (en) |
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2003
- 2003-11-13 US US10/712,589 patent/US7074841B2/en not_active Expired - Fee Related
-
2004
- 2004-10-13 WO PCT/US2004/033808 patent/WO2005052040A1/en active Application Filing
- 2004-10-13 JP JP2006539506A patent/JP2007513219A/en active Pending
- 2004-10-13 EP EP04795027A patent/EP1694751A1/en not_active Withdrawn
- 2004-10-13 KR KR1020067009314A patent/KR20060107779A/en not_active Application Discontinuation
- 2004-10-13 CN CNA2004800336021A patent/CN1882642A/en active Pending
- 2004-10-13 CA CA002545173A patent/CA2545173A1/en not_active Abandoned
- 2004-11-12 TW TW093134824A patent/TW200524961A/en unknown
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2006
- 2006-05-22 US US11/419,515 patent/US7435498B2/en not_active Expired - Fee Related
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Also Published As
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US7074841B2 (en) | 2006-07-11 |
JP2007513219A (en) | 2007-05-24 |
US20060205829A1 (en) | 2006-09-14 |
US7435498B2 (en) | 2008-10-14 |
KR20060107779A (en) | 2006-10-16 |
EP1694751A1 (en) | 2006-08-30 |
CN1882642A (en) | 2006-12-20 |
CA2545173A1 (en) | 2005-06-09 |
US20050107489A1 (en) | 2005-05-19 |
TW200524961A (en) | 2005-08-01 |
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