| abstract |
[PROBLEMS] To provide a polymer having a high molecular weight, softening temperature and ion exchange capacity, a production method capable of producing the polymer with high productivity, an electrolyte membrane having high mechanical strength even at high temperatures, high proton conductivity, and excellent output characteristics. Providing membrane electrode assemblies suitable for high-temperature operation. A polymer obtained by a method comprising polymerizing at least one of compound (m1) and compound (m2) and tetrafluoroethylene at 100 to 200 ° C. using ditert-butyl peroxide is used as an electrolyte membrane. Used for 15 etc. Q 1 , Q 21 , Q 22 = perfluoroalkylene group, etc. Y 2 = fluorine atom, etc. [Selection] Figure 1 |