Polymer electrolyte membrane, block copolymer, polymer electrolyte material, polymer electrolyte molded body, electrolyte membrane with catalyst layer, membrane electrode composite, solid polymer fuel cell, and water electrolytic hydrogen generator

Abstract

[Problem] Developed is a polymer electrolyte membrane having excellent proton conductivity even under low-humidity conditions, and having excellent mechanical strength and chemical stability. [Solution] A polymer electrolyte membrane containing a block copolymer having one or more ionic segments and one or more nonionic segments, wherein the ion exchange capacity (meq/g) of the block copolymer is more than 2.0 and less than 3.1, wherein the polymer electrolyte membrane has a co-continuous phase-separation structure, wherein the average period size (nm) of the co-continuous phase-separation structure is less than 110 nm as observed by transmission electron microscopy, and wherein the average period size (nm) of the co-continuous phase-separation structure and the ion exchange capacity (meq/g) satisfy the relation of: average period size (nm)/ion exchange capacity (meq/g)≥21.

Dependencies are inferred from the claim text.