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No satisfactory quantitative relationships exist between polymer swelling parameters and some distinct physical-chemical parameters of organic solvents producing this swelling. Such relationships can only be obtained by means of linear multiparameter equations, which take into account the energy needed for cavity formation in solvents and also solvation effects. The advantages of such an approach are supported by examples of the generalization of experimental data for the swelling of many polymers and coals.

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A quantitative generalization of the indices of swelling process of polymers, containing the nonhydrocarbon groups (polyurethanes, fluoropolymers) in organic solvents, as well as of the process of dissolution of poly-(methy1 methacrylate) was successfully realized by means of multiparametric equations, which take into account the solvents capacity for specific and nonspecific solvation of polymers and solvents' molar volumes.