The present invention provides a polysulfone-based polymer comprising a repeating unit represented by the following formula (1):; Formula 1 ;In this formula,;X, M 1 , M 2 , a, b, c, d, e, f, R 1 , R 2 , R 3 , R 4 and n refer to the detailed description of the invention.;Polysulfone-based polymers, fuel cells
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