Solubility coefficients for CO2, Ar and CH4 in polystyrene (PS) films with glass transition temperatures (Tg) of 52 to 107°C were measured in a pressure-decay sorption apparatus at 1 atm over a temperature range of 20 to 90°C. The gas solubility at 30°C increased as the T s of the PS increased; the heat of solution was largest for the PS with the highest Tg. This observed dependence of gas solubility on T s was analysed in terms of enthalpy-temperature relationships for glassy polymers. The solubilities for PS samples with different glass transition temperatures converged when comparisons were made on the basis of states of equal enthalpy instead of the temperature of measurement.
Посилання на статтю:
Gas solubility in glassy polymers-- a correlation with excess enthalpy / D. H. Rein, R. F. Baddour and R. E. Cohen // Polymer. – 1992. – Vol 33. – P. 1696-1700.