Studies on syntheses and permeabilities of special polymer membranes. 48. Transport of organic ions through crosslinked poly(isobutylene‐alternative co‐maleic anhydride) membranes

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Abstract
Ion exchange membranes with carboxyl groups, which were insoluble in acidic and alkaline aqueous solutions, were prepared from poly(isobutylene‐alternative co‐maleic anhydride) and poly(vinyl alcohol). When a membrane, one side of which was alkaline, the other, acidic, was fixed in a diaphragm cell, it transported organic ions, such as amino acids and aniline, from the acidic to the alkaline side or vice versa. The passage of organic ions through the membrane was governed by an electrochemical interaction between carboxyl groups in the membrance and transporting ions. The direction of the organic ions depended on a pH difference between the two sides of the membrane.