| abstract |
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. |