BLOCK COPOLYMER, AND POLYMER ELECTROLYTE, POLYMER ELECTROLYTE MEMBRANE, MEMBRANE ELECTRODE ASSEMBLY AND FUEL CELL USING SAME

摘要

A polymer electrolyte for a fuel cell is provided at low cost which has excellent mechanical characteristics, resistance to oxidation and high ion conductivity, and which hardly swells. The polymer electrolyte includes a block copolymer containing a hydrophilic segment and a hydrophobic segment. The hydrophilic segment contains a structural unit represented by the following chemical formula (1).