Abstract
Amphoteric ion-exchange composite membranes were prepared by forming ultra-thin layer of partially quarternized polymer of partially chloromethylated polystyrene, on a porous polyvinylchloride support membrane, and by introducing cross-linkages and sulfonic acid groups intothe ultra-thin layer through dipping the composite membrane into concentrated sulfuric acid.The membrane thus prepared exhibited a similar permselectivity to saccharose as the cellulose acetate asymmetric membrane, but very low permselectivity to sodium chloride.
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