Solid polymer electrolyte material, liquid composition, solid polymer fuel cell and fluoropolymer

摘要

A solid polymer electrolyte material made of a copolymer comprising a repeating unit based on a fluoromonomer A which gives a polymer having an alicyclic structure in its main chain by radical polymerization, and a repeating unit based on a fluoromonomer B of the following formula (1): CF₂-CF(R^f)_jSO₂X (1) wherein j is 0 or 1, X is a fluorine atom, a chlorine atom or OM {wherein M is a hydrogen atom, an alkali metal atom or a group of NR¹R²R³R⁴ (wherein each of R¹, R², R³ and R⁴ which may be the same or different, is a hydrogen atom or a monovalent organic group)}, and R^f is a C_1-20 polyfluoroalkylene group having a straight chain or branched structure which may contain ether oxygen atoms.