Solid polymer electrolyte membrane, solid polymer fuel cell and fluorpolymer

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)jSO2X wherein j is 0 or 1, X is a fluorine atom, a chlorine atom or OM äwherein M is a hydrogen atom, an alkali metal atom or a group of NR<1>R<2>R<3>R<4> (wherein each of R<1>, R<2>, R<3> and R<4> which may be the same or different, is a hydrogen atom or a monovalent organic group)ü, and R is a C1-20 polyfluoroalkylene group having a straight chain or branched structure which may contain ether oxygen atoms.