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SPAE (Sulfonated poly(arylene ether sulfone), SPAES) copolymers exhibit a lot of advantages such as a relatively low production cost, and easy control of ionic conductivity and gas barrier properties, when they are used as membrane materials for polymer electrolyte fuel cells, redox flow batteries, and electrolysis. SPAES copolymer membranes are fabricated by evaporating polar aprotic solvents from their concentrated solutions. This conventional process, however, is needed to be excluded, owing to additional production cost associated with the organic solvent separation and hazardous issues. In this study, a benign membrane fabrication method is developed based on SPAES nanodispersions in water-alcohol mixtures. Their fundamental characteristics are systematically investigated in comparison with those made from the conventional method.
