Patent ID: 7455934

Claim:
A material for a solid polyelectrolyte, comprising a multi-segmented fluoropolymer that comprises a block copolymer and/or a graft copolymer, wherein the copolymer contains one or more blocks essentially consisting of segment A and one or more blocks essentially consisting of segment B, the segment A combines with the segment B, wherein the segment A has a molecular weight of 5,000 to 1,000,000, and the Segment A is a copolymer chain comprising: (a) an ethylenic fluoromonomer containing sulfonic acid functional groups each represented by Formula (1) CX 2 ═CX 1 —(O) n —Rf—SO 2 Y (1) wherein X and X 1 may be the same or different and are each hydrogen or fluorine; Y is F, Cl, or OY 1 wherein Y 1 is hydrogen, alkali metal or C 1 to C 5 alkyl; Rf is C 1 to C 40 divalent fluoroalkylene or C 1 to C 40 divalent fluoroalkylene having one or more ether bonds; and n is 0 or 1; and (b) at least one type of ethylenic fluoromonomer copolymerizable with the ethylenic fluoromonomer (a) and containing no sulfonic acid functional groups, the segment B is a fluoropolymer containing no sulfonic acid functional groups, has a molecular weight of 3,000 to 1,200,000, and has a crystalline melting point of 100° C. or higher or a glass transition point of 100° C. or higher, wherein the ratio of segment A:segment B in the segmented fluoropolymer is 30:70 to 90:10 wt. %.