Kinetics of swelling of polyvinyl alcohol gel and PVA–magnetite composite in an electrolyte medium

This article investigates the kinetics of the settling (swelling/contraction) process of polyvinyl alcohol gel and of a PVA– magnetite composite in solutions of disodium succinate (C2H4(COONa)2) at various concentrations. The study is based on a physico-mathematical heterophase model of the polymer gel structure. The precipitation (contraction/swelling) process was studied experimentally by optical micrometry, establishing the dependence of the degree of precipitation on solution concentration and water activity. Within the framework of the model, the kinetic coefficients k1, k2 and k3 were calculated and their dependence on the composition of the external solution was analyzed. The results have important scientific and practical value for assessing the physico-chemical properties of polymer sorbents and their application in analytical and sensor systems.

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