| 摘要 |
Disclosed is a polymer electrolyte having a protonic acid group that is excellent in thermal stability and dimensional stability. The polymer electrolyte includes copolymers having a sulfonic acid group which has a structure represented by the following formula: wherein X is a divalent electron-withdrawing group; Y is an oxygen or a sulfur; Z and Q are each a direct bond, -O-, -S-, -CO-, -SO2-, -[C(R')2]g- (g: integer of from 1 to 8), etc.; R, R' and R1 to R16 are each a hydrogen, a fluorine, an alkyl, a fluorine-substituted alkyl, an aryl or a nitrile; m, n, p, q, r, s, t and u are each an integer of from 0 to 4 (with the proviso that p+q>=1); and A is a group represented by Formula (5a) or (5b) below: wherein W is a divalent electron-withdrawing group; S is a protonic acid group; i is an integer of from 1 to 5; and j is an integer of from 1 to 7.
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