Abstract A sulfonated derivative of polybenzimidazole is reported, and its properties are analyzed in comparison with related polybenzimidazole proton‐conducting materials. Poly(2,5‐benzimidazole), poly( m ‐phenylenebenzobisimidazole), and poly[ m ‐(5‐sulfo)‐phenylenebenzobisimidazole] were prepared...
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