POLYELECTROLYTE FILM

摘要

Provided is a polymer electrolyte membrane that is formed of a fluorine free material, is soft and hardly cracks, and is excellent in hot water resistance. The polymer electrolyte membrane is obtained by crosslinking a block copolymer (Z) containing a polymer block (A) containing a structural unit derived from an aromatic vinyl compound and having an ion-conducting group; and an amorphous polymer block (B) containing a structural unit derived from an unsaturated aliphatic hydrocarbon and free of any ion-conducting group, the block copolymer (Z) being crosslinked with a crosslinking agent (X) having, in a molecule thereof, two or more aromatic rings of which one or more hydrogen atoms are substituted with hydroxy groups.