| abstract |
[PROBLEMS] To provide a solid polymer electrolyte and a proton conductive membrane having high proton conductivity, high dimensional stability, and high mechanical strength. [Solution] The polymer segment (A) having a sulfonic acid group and the polymer segment (B) having substantially no sulfonic acid group, and the polymer segment (B) having substantially no sulfonic acid group are described below. A polyarylene block copolymer having a structural unit represented by the formula (1). (In the above formula (1), R 1 is a halogen atom, a hydrocarbon group having 1 to 20 carbon atoms, etc. L is a structural unit represented by the formula (1-1) or (1-2), and there are a plurality of units. At least one of L is a structural unit represented by the following formula (1-1), a represents an integer of 0 to 3, and p represents an integer of 2 to 200. In formula (1-1), A represents , —O— or —S—, R 2 represents a hydrocarbon group having 1 to 20 carbon atoms, X 1 represents a halogen atom, b represents 1 to 4, and l represents an integer of 0 to 3. In (1-2), A is —O— or —S—, D is a direct bond, —O—, —S— or the like structure, R 3 and R 4 are hydrocarbons having 1 to 20 carbon atoms. X 2 and X 3 such as a group are halogen atoms, c and d are integers of 0 to 4, m and n are integers of 0 to 4, and q is an integer of 0 to 4.) |