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Laboratory study reveals effective radioinduced styrene grafting onto PTFE to form cation-selective membranes, indicating that dilution increases swelling and lowers permselectivity.
Permselective cationic membranes were prepared by a radioinduced grafting method of styrene onto PTFE, and a preirradiation technique was used. Some attempts were made to characterize the membranes. They show mechanical properties similar to the PTFE matrix, and good electrochemical behavior, i.e., good permselectivity, which, nevertheless, decreased with decreasing solutions concentration. Such behavior has been related to a larger swelling in diluted solutions. Swelling properties in aqueous solutions of KCl and some organic solvents are also reported.
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Munari et al. (1967) studied this question.
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