Polymer electrolyte membranes crosslinked by nitrile...

Details Polymer electrolyte membranes crosslinked by nitrile... Polymer electrolyte membranes crosslinked by nitrile...

2006-05-22

2008-10-14

McClendon, Sanza L (Department: 1796)

Chemistry: electrical current producing apparatus, product, and

With pressure equalizing means for liquid immersion operation

C429S006000, C429S010000, C521S027000, C521S030000, C521S031000, C521S038000, C521S032000, C521S033000, C528S401000, C526S242000, C526S243000, C526S248000, C526S249000, C252S182100

Reexamination Certificate

active

07435498

ABSTRACT:
A method is provided for 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. The resulting polymer electrolyte membrane comprises a highly fluorinated polymer comprising: a perfluorinated backbone, first pendent groups which comprise sulfonic acid groups, and crosslinks comprising trivalent groups according to the formula:The first pendent groups are typically according to the formula: —R1—SO3H, where R1is a branched or unbranched perfluoroalkyl or perfluoroether group comprising 1-15 carbon atoms and 0-4 oxygen atoms, most typically —O—CF2—CF2—CF2—CF2—SO3H or —O—CF2—CF(CF3)—O—CF2—CF2—SO3H.

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