Abstract
In this study, we prepared novel PVA-based cation-exchange membranes having monovalent cation permselectivity by coating one of the membrane surfaces with an aqueous solution of PVA-based block copolymers. To determine the permselectivity between Na+ ions and Ca2+ ions through the membrane, electrodialysis was carried out using a mixed NaCl and CaCl 2 solution. The permselectivity for Na+ ions against Ca2+ ions through the membrane increased with increasing coating concentration while membrane resistance was almost independent of the coating concentration. These results indicate that our modification method can be used to prepare a membrane with high permselectivity for monovalent ions without changing its membrane resistance.
