| abstract |
Disclosed is a solid polymer electrolyte material for solid polymer fuel cells which has high ion exchange capacity and low resistance. This electrolyte material has a higher softening temperature than the conventional electrolyte materials. Specifically disclosed is an electrolyte material for solid polymer fuel cells which is composed of a polymer having a repeating unit derived from a radically polymerizable fluorine-containing monomer. This electrolyte material for solid polymer fuel cells is characterized in that the repeating unit contains a structure having an ionic group represented by the formula (α) below in a side chain. (α) (In the formula, Q1 and Q2 independently represent a single bond or a perfluoroalkyl group which may contain an ether oxygen atom, but they are not single bonds at the same time; Rf1 represents a perfluoroalkyl group which may contain an ether oxygen atom; X represents an oxygen atom, a nitrogen atom or a carbon atom, and a = 0 when X is an oxygen atom, a = 1 when X is a nitrogen atom, and a = 2 when X is a carbon atom; and Y represents a fluorine atom or a monovalent perfluoro organic group.) |