AbstractPoly(p‐phenylene sulfide sulfonic acid) was thermally crosslinked for use as a cation exchange polymer with high thermal stability. The decomposition temperature (Td) of the polymer increases with an increase in the crosslinking temperature. The crosslinking reaction at 300°C in air resulted in the formation of a strongly acidic cation exchange polymer with a T d 10= 467°C and having an SO2bond, whose crosslinked structure was investigated using IR spect
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