POLYMER ELECTROLYTE, POLYMER ELECTROLYTE FILM, FILM-ELECTRODE ASSEMBLY, AND SOLID POLYMER FUEL CELL

摘要

Disclosed are: a polymer electrolyte which has high ion conductivity even when placed under low-moisture conditions, is swollen with water to a less extent, and can serve as an alternate for fluorine-containing polymer electrolytes such as Nafion; and a polymer electrolyte film, a film-electrode assembly and a solid polymer fuel cell each produced by using the polymer electrolyte. Specifically disclosed are: a polymer electrolyte comprising a block copolymer composed of at least an aromatic vinyl polymer block (A) and an aliphatic vinyl polymer block (B) as constituents, and characterized in that the content of an ion-conducting group in the aromatic vinyl polymer block (A) is 1.5 to 3.0 groups per repeating unit and the rubber polymer block (B) has no ion-conducting group; and a polymer electrolyte film, a film-electrode assembly and a solid polymer fuel cell, each of which is produced using the polymer electrolyte.