The permeability coefficients for He, O 2 , N 2 , CH 4 , and CO 2 in miscible blends of polystyrene (PS) and tetramethyl bisphenol‐A polycarbonate (TMPC) at 35°C and 1 atm driving pressure are reported. Sorption isotherms for CO 2 and CH 4 are also presented. The isotherms were fitted to the dual sorption model. The Langmuir capacity factor was found to follow an earlier correlation based on unrelaxed volume. For each gas, the permeability was found to go through a minimum when plotted against blend composition. This behavior is primarily the result of the volume change on mixing observed for this system. The attractive interaction between TMPC and PS is relatively strong as indicated by density and solubility data. The value of the binary interaction parameter was found to be of the same magnitude as that for poly(phenylene oxide) (PPO)‐polystyrene (PS) blends. Considering the similarity of structure between PPO and TMPC, it is concluded that similar phenyl‐phenyl interactions and conformational changes on blending may prevail in TMPC/PS blends.
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Muruganandam et al. (1987) studied this question.
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