| abstract |
PROBLEM TO BE SOLVED: To provide an MEA having excellent hot water resistance. MEA is constituted using a membrane containing an aromatic polymer represented by the following general formula (1). [Chemical 1] (In the formula, A independently represents either —CO— or SO 2 —, B independently represents an oxygen atom or a sulfur atom, and R 1 to R 8 may be the same as or different from each other, and represent a hydrogen atom. , A fluorine atom, an alkyl group, a phenyl group or a nitrile group, R 9 to R 24 may be the same as or different from each other, represent a hydrogen atom, an alkyl atom or a phenyl group, and a represents an integer of 0 to 4. .) [Selection figure] None |