Abstract:
PURPOSE: A manufacturing method of a polybenzimidazole-based polymer is provided to manufacture a polybenzimidazole-based polymer having excellent dimensional stability and mechanical strength even with excellent ion conductivity. CONSTITUTION: A manufacturing method of a polybenzimidazole-based polymer comprises a step of introducing electron withdrawing functional group into a benzimidazole-based polymer. The electron withdrawing functional group is one or more selected from a group consisting of carboxylic acid(-CO2H), cyan(-CN), fluorine (-F) and sulfonic acid. The benzimidazole-based polymer is a sulfonated poly(2,5-benzimidazole)based polymer. An electrolyte membrane comprises the polybenzimidazole-based polymer.