An ion exchange membrane containing carboxyl groups, insoluble in acidic and alkaline aqueous solutions, was prepared from poly(isobutylene-alternating co-maleic anhydride) and poly(vinyl alcohol). Using the membrane in a diaphragm cell, one side being adjusted to be acidic and the other alkaline, it was possible to transport actively and selectively alkali metal ions through the membrane from the alkaline side to the acidic side.
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Uragami, T., Watanabe, S., Nakamura, R. et al. Studies on syntheses and permeabilities of special polymer membranes. Polymer Bulletin 7, 71–76 (1982). https://doi.org/10.1007/BF00265454
- Aqueous Solution