Abstract
The molecular transport of benzene, toluene, p-xylene, ethylbenzene, chlorobenzene, 1,2-dichlorobenzene, and mesitylene into miscible polymeric blends of ethylene-propylene random copolymer and isotactic polypropylene has been investigated at 25, 40, 55, and 70°C. For all liquids, the solvent transport rate, equilibrium uptake and degree of penetrant overshoot are influenced by the nature of the solvent molecules and by the temperature. Sorption- desorption-resorption-redesorption (S-D-RS-RD) experiments have been carried out to determine the sorption equilibrium and diffusion coefficients. These S-D-RS-RD experiments are a convenient way of studying the weight loss, if any, during the long-term solvent exposure, which may be associated with the release of residuals. The activation parameters for diffusion, permeation, and sorption have been obtained. The concentration dependence of diffusivity has been studied. The morphology of the membrane material has been investigated using XRD and scanning electron microscopy.
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