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 an ionic group; and a segment (A2) not containing an ionic group. The polymer electrolyte membrane forms a co-continuous (M1) or lamellar phase-separated (M2) 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,该膜即使在低湿度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,在制成聚合物电解质燃料电池时可实现高输出和优异的物理耐久性。
聚合物电解质膜包括嵌段共聚物,嵌段共聚物包含以下每一种或多种:含有离子基团的区段(A1);不含离子基团的区段(A2)。聚合物电解质膜形成共连续(M1)或层状相分离(M2)结构,通过差示扫描量热法测定的结晶热量为 0.1 焦耳/克或更大,或通过广角 X 射线衍射测定的结晶度为 0.5%或更大。