Ion Transport Properties of Anion Exchange Membranes Prepared from Poly (Vinyl alcohol) and Poly (Allylamine)

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  • Nishimura Megumi
    Applied Fine Chemistry, Graduate School of Science and Engineering, Yamaguchi University
  • Higa Mitsuru
    Applied Fine Chemistry, Graduate School of Science and Engineering, Yamaguchi University

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  • ポリビニルアルコールとポリアリルアミンを用いたアニオン交換膜のイオン輸送特性

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Anion exchange membranes with interpenetrating network structures were prepared by blending PVA and a polycation, poly (allylamine). The membranes obtained were physically cross-linked by annealing them and chemically cross-linked by reaction with various concentrations of glutaraldehyde (GA) aqueous solutions. The effect of the cross-linking conditions and polycation content on the ionic transport properties through the membranes was investigated. The water content of the membranes increased with increasing polycation content and with decreasing GA concentration, CGA. The effective charge density of the membranes increased with increasing polycation content, Cpc. The highest value of the effective charge density was 0.78mol dm–3 at the membrane of Cpc=20wt.% and CGA=0.10vol.%. The electric resistance of the membranes also depended on polycation content and GA concentration. The membrane of Cpc=20wt.% and CGA=0.01vol.% had the lowest membrane resistance (1.23Ωcm2) of all the membranes.<br>The dynamic transport number of the membranes increased with increasing polycation content and with increasing GA concentration while the membrane resistance also increased with increasing GA concentration. These results indicate that the ion transport properties of the PVA-based anion exchange membranes can be controlled by changing the polycation content and the cross-linking conditions.

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