To obtain a sulfonate group-containing segmented block copolymer not only expressing more excellent proton conductivity than that of conventional polymers but being excellent in stability under high temperature and moisture and provide a composition, a molded product, a proton exchange membrane for fuel cells and a fuel cell.
The sulfonate group-containing block copolymer comprises one or more first segments and one or more second segments in the molecule, wherein the first segments mainly comprises a structure expressed by chemical formula 1 (wherein X expresses H or a monovalent cation; Y expresses a sulfonyl group or a carbonyl group; Ar1 expresses a divalent aromatic group; n expresses 3-50 integer) and the second segments mainly comprises a structure expressed by chemical formula 2 (wherein Ar2 expresses a divalent aromatic group having an electron-attracting group; m expresses 3-50 integer; Z expresses O or S).
SAKAGUCHI YOSHIMITSU
Toshio Morita
Yoshihei Nakamura
Yutaka Horii
Hisato Noda
Masayuki Sakai