Polymer electrolyte membrane
A polymer electrolyte membrane is provided having a thickness of 90 microns or less and comprising a polymer, said polymer comprising a highly fluorinated backbone and recurring pendant groups according to the formula:YOSO2—CF2—CF2—CF2—CF2—O-[polymer backbone]  (I)where Y is H+ or a monovalent cation such as an alkali metal cation. Typically, the membrane is a cast membrane. Typically, the polymer has a hydration product of greater than 22,000. Typically, the polymer has an equivalent weight of 800-1200.
3M Innovative Properties Company
C H H C H Y H Y
C08J H01M H01M C08J H01M Y02P H01M Y02E
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George Gower Innes Steven Joseph Harold Todd Linda Mae
Moore Hamrock Freemyer Rivard