The solubility coefficients measured at higher temperatures² were recalculated to convert them into the same unite as in Ref. 3, i.e., (cm³(STP)/cm³ atm). Volumetric thermal expansion coefficients⁴ 2X10^-4 K^-1 at T<T_g (·) and 6x10^-4 K^-1 at T>T_g (0) were used in the calculation. It is seen that the slopes of the linear dependence and, hence, the enthalpies of sorption change when passing from glassy to rubbery state of PS. The point reported by Durrill and Griskey was not included, tentatively, into the calculation. The enthalpies of sorption corresponding the glassy and rubbery states are equal to -34.2 and -15.4 kJ/mol, respectively.

FIG. 18.
The solubility of chlorofluoromethane (Freone 22) in PS was measured only in three papers.^1-3. Barrie et al.³ studied this system using a gravimetric technique in the temperature range 293-333 K. At much higher temperatures, this system was investigated by means of inverse gas chromatography.² The figure shows the temperature dependence T/K of the solubility coefficient S/(cm³(STP) g^-1atm^-1).