The swelling and adsorption arising in the case of the polymolecular sorption of the vapour of low-molecular substances by swelling polymers can be satisfactorily described in terms of Frenkel-Halsey-Hill (FHH) theory. The FHH equation has been used to analyze the sorption and swelling isotherms obtained from the sorption of water vapour by styrene/divinylbenzene copolymers possessing surface amino groups. The notion of the ‘monolayer swelling volume’ has been introduced by the authors to obtain an equation which describes the characteristic swelling curve for the group of substances investigated.
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