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Sulfonated polybenzimidazoles (SPBI) with different sulfonation degrees were prepared from 3,3′,4,4′-amino-diphenyl ether, 5-sulfonated isophthalate sodium and isophthalic acid by direct polycondensation in polyphosphoric acid. Considering the conductivity and oxidative stability of the SPBIs with different sulfonation degrees, the SPBI-10 membrane was optimally selected as base membrane. In order...
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