10. Gupta, Ram B.; Prausnitz, John M. Vapor-liquid equilibria for copolymer/solvent systems: effect of "intramolecular repulsion". Fluid Phase Equilib. (1996), 117(1-2), 77-83.

Abstract

Acrylonitrile/butadiene copolymers have higher affinity for acetonitrile solvent than do polyacrylonitrile or polybutadiene. This non-intuitive behavior is attributed to intramol. repulsion between unlike segments of the copolymer. This repulsive interaction is weakened when acetonitrile mols. are in the vicinity of unlike copolymer segments, favoring copolymer-solvent miscibility. Similar behavior is obsd. when acetonitrile is replaced by Me Et ketone. This effect has not been reported previously for vapor-liq. equil. [VLE]. VLE data were obtained for mixts. contg. a solvent and a copolymer as a function of copolymer compn. It appears that, at a given solvent partial pressure, there may be copolymer compn. that yields max. absorption of the solvent. This highly non-ideal VLE phase behavior may be useful for optimum design of a membrane for sepn. processes.

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