Abstract
A new relation is derived to express the dependence of gas solubility in polymers on pressure, under conditions where the polymers are significantly plasticized by the penetrant gases. This relation show that, for such conditions, the solubility isotherms have an inflection point which indicates a change in the solution mechanism. This transition is attributed to the fact that plasticizing penetrants can depress the glass transition temperature of penetrant/polymer systems to the temperature of the isotherms at sufficiently high concentrations. The new solubility relation describes satisfactorily the solubility isotherms for CO 2 in several glassy polymers reported by Chiou, Maeda, and Paul and by Kamiya et al
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