To provide a polymer electrolyte membrane that has excellent proton conductivity even under low-humidification conditions, has excellent mechanical strength and chemical stability, and can achieve high output and excellent physical durability when made into a polymer electrolyte fuel cell.
The polymer electrolyte membrane includes a block copolymer containing each one or more of: a segment (A1) containing anionic group; and a segment (A2) not containing an ionic group. The polymer electrolyte membrane forms a co-continuous (M
1
) or lamellar phase-separated (M
2
) structure, and gives a crystallization heat quantity of 0.1 J/g or larger determined by differential scanning calorimetry, or a degree of crystallinity of 0.5% or larger determined by wide-angle X-ray diffractometry.
                            提供一种聚合物电解质膜,即使在低加湿条件下也具有优异的质子传导性,具有优异的机械强度和
化学稳定性,并且在制成聚合物电解质燃料电池时可以实现高输出和优异的物理耐久性。该聚合物电解质膜包括一个嵌段共聚物,其中每个嵌段共聚物包含以下至少一种:含有阴离子基团的嵌段(A1);和不含有离子基团的嵌段(A2)。该聚合物电解质膜形成一个共连续(M1)或层状相分离(M2)结构,并且通过差示扫描量热法确定具有0.1 J/g或更大的结晶热量,或通过广角X射线衍射法确定具有0.5%或更大的结晶度。