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Infrared investigation of ionic hydration in ion-exchange membranes. Part 1. - Alkaline salts of grafted polystyrene sulphonic acid membranes

par Levy, Leo ;Jenard, André ;Hurwitz, Heinz Dieter
Référence Journal of the Chemical Society. Faraday Transactions I, 76, page (2558-2574)
Publication Publié, 1980

Article révisé par les pairs

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Résumé :

Infrared spectroscopic measurements have been performed on thin ion-exhange membranes which consist of alkaline salts of polystyrene sulphonic acid grafted on a Teflon FEP matrix. The membranes under investigation were placed in isopiestic equilibrium with water vapour in the sampling cell. The water content of these FEP-PSSA systems has been determined at 25°C by measuring the integrated absorbance of the sorbed-water bending vibration as a function of the nature of the cation. The dependence of the position of the water stretching and bending vibration bands and of the symmetric vibration of the SO3- groups with the nature of the cation and the water content has led to various conclusions concerning the ionic interaction and hydration in the membrane. The peculiar behaviour of Li+ is due to its ability to interact strongly with the anion. A model of ion clustering has been proposed to explain the spectra of water in the presence of large alkali ions.