To provide a simple method whereby an ionic polymer membrane having a high ion exchange capacity and a low water uptake can be produced by converting a —SO2F group in a polymer to a pendant group having multiple ion exchange groups, while preventing a cross-linking reaction.
At the time of obtaining an ionic polymer membrane by converting —SO2F (group (1)) in a polymer sequentially to —SO2NZ1Z2 (group (2)), —SO2N−(Mα+)SO2(CF2)2SO2F (group (3)), —SO2N−(H+)SO2(CF2)2SO2F (group (4)) and —SO2N−(Mβ+)SO2(CF2)2SO3−Mβ+ (group (5)), the polymer is formed into a polymer membrane in the state of any one of the groups (1) to (4), and the polymer membrane is thermally treated in the state of group (4). Here, Z1 and Z2 are hydrogen atoms, etc., Mα+ is a monovalent cation, and Mβ+ is a hydrogen ion or a monovalent cation.
提供一种简单的方法,通过将聚合物中的 -SO2F 基团转化为具有多个离子交换基团的悬垂基团,在防止发生交联反应的同时,生产出具有高离子交换能力和低吸
水性的离子聚合物膜。
将聚合物中的-SO2F(基团(1))依次转化为-SO2NZ1Z2(基团(2))、-SO2N-(Mα+)SO2(
CF2)2SO2F(基团(3)),从而获得离子聚合物膜、-SO2N-(H+)SO2(
CF2)2SO2F(第(4)组)和-SO2N-(Mβ+)SO2(
CF2)2SO3-Mβ+(第(5)组),聚合物在第(1)至(4)组中任意一组的状态下形成聚合物膜,聚合物膜在第(4)组的状态下进行热处理。这里,Z1 和 Z2 是氢原子等,Mα+ 是一价阳离子,Mβ+ 是氢离子或一价阳离子。