Abstract
A novel apparatus to measure precisely both pure and mixed gas sorption in glassy polymers is described. A method for accurate calibration and operation of the equipment is discussed, based upon complete closure of the material balance of all gaseous components in all phases. The description is accompanied by pure and mixed gas sorption equilibria measured with this equipment for the system CO 2/C 2H 4/Poly(methyl methacrylate) (PMMA) at 35°C. The observed reduction in sorption of individual components is explained by competition between the penetrants for the unrelaxed volume fraction in a glassy polymer. This effect is a natural consequence of the dual mode sorption model applied to mixed penetrants.
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