POLYMER ELECTROLYTIC SUBSTANCE FOR FUEL CELL, AND FUEL CELL

摘要

PROBLEM TO BE SOLVED: To provide a polymer electrolytic substance which can be easily synthesized at low cost and has high water-proofness and high output function by using sulfonated polymer produced by sulfonation of only a structural unit having a specified formula and having specified ionexchange group equivalent weight as the solid electrolytic substance. SOLUTION: This polymer electrolytic substance for a fuel cell is a sulfonated polymer which is obtained by sulfonating only a structural unit having a structural formula II of a copolymer comprising a structural unit having a structural formula I and the structural unit having the structural formula II and has 500-2500g/mol ion-exchange group equivalent weight. In the structural unit having the formula II, Ar stands for a divalent aromatic group.