In this study, we prepared novel PVA-based anion-exchange membranes with monovalent anion permselectivity by coating one of the membrane surfaces with an aqueous solution of PVA-based block copolymers. To determine the permselectivity between Cl − ions and SO 4 2− ions through the membrane, electrodialysis was carried out using a mixed NaCl and Na 2 SO 4 solution. The permselectivity for Cl − ions against SO 4 2− ions through the membrane increased with increasing coating solution concentration

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... while membrane resistance was almost independent of the coating solution concentration. Also, a coating layer having a higher amount of charge group showed higher permselectivity. These results indicate that our modification method can be used to prepare a membrane with high permselectivity for monovalent anions without changing its membrane resistance.