Abstract
The solubility of CO 2, CH 4, A, and N 2 in oriented and unoriented polystyrene films at 25°C, has been investigated by the direct sorption method. It has been found that Henry's law does not apply to sorption of CO 2 and CH 4. The results can be quantitatively described by the postulation of two concurrent mechanisms for sorption: ordinary dissolution and microvoid-filling. The dissolution constants are correlated with the gas force constants, ϵ k . The abnormally high solubility of CH 4 is probably due to the high polarizability of this gas. The hole-affinity constants are also correlated with ϵ k . The deviation of CH 4 is consistent with the behavior of the dissolution constant. The correlation of hole-filling constants with surface areas occupied by the individual gas molecules has been successful. Stress-induced orientation of polystyrene does not change the nature of the sorption processes; however, it decreases the level of solubility. Orientation decreases the hole-filling constants and the Henry's law solubility constants whereas it slightly increases the hole-affinity constants.
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