Polymer electrolyte membrane, block copolymer, polymer electrolyte material, polymer electrolyte molded body, electrolyte membrane with catalyst layer, membrane electrode assembly, solid polymer fuel cell, and water electrolysis hydrogen generation device

The polymer electrolyte membrane provided by the invention also has excellent proton conductivity, mechanical strength and physical durability under a low humidification condition. Provided is a polymer electrolyte membrane which contains a block copolymer that contains one or more ionic segments and one or more non-ionic segments, the ion exchange capacity of the block copolymer being greater than 2.0 and less than 3.1, and which has a co-continuous phase separation structure, the average period size of the co-continuous phase separation structure observed by a transmission electron microscope is less than 110 nm, and the average period size (nm) of the phase separation structure and the ion exchange capacity (meq/g) satisfy the following relationship: average period size/ion exchange capacity > = 21. 本发明的高分子电解质膜在低加湿条件下也具有优异的质子传导性，机械强度和物理耐久性也优异。一种高分子电解质膜，其包含嵌段共聚物，所述嵌段共聚物含有离子性链段和非离子性链段各1个以上，所述嵌段共聚物的离子交换容量大于2.0且小于3.1，所述高分子电解质膜具有共连续相分离结构，通过透射电子显微镜观察到的所述共连续相分离结构的平均周期尺寸小于110nm，所述相分离结构的平均周期尺寸(nm)与所述离子交换容量(meq/g)满足