08. Gupta, Ram B.; Prausnitz, John M. Vapor-Liquid Equilibria of Copolymer + Solvent and Homopolymer + Solvent Binaries: New Experimental Data and Their Correlation. J. Chem. Eng. Data (1995), 40(4), 784-91.

Abstract

Sixty-four isothermal data sets for vapor-liq. equil. (VLE) for polymer + solvent binaries have been obtained using a gravimetric sorption technique, in the range 23.5-80. Solvents studied were acetone, acetonitrile, 1-butanol, 1,2-dichloroethane, chloroform, cyclohexane, hexane, methanol, octane, pentane, and toluene. Copolymers studied were poly(acrylonitrile-co-butadiene), poly(styrene-co-acrylonitrile), poly(styrene-co-butadiene), poly(styrene-co-Bu methacrylate), poly(vinyl acetate-co-ethylene), and poly(vinyl acetate-co-vinyl chloride). All copolymers were random copolymers. Some homopolymers were also studied: polyacrylonitrile, polybutadiene, poly(Bu methacrylate), poly(ethylene oxide), polystyrene, and poly(vinyl acetate). The compn. of the copolymer may have a surprising effect on VLE. Normally, deviation from ideal behavior lies between those of the constituent homopolymers, according to the copolymer compn., as obsd. for cyclohexane + poly(ethylene-co-vinyl acetate) and chloroform + poly(styrene-co-Bu methacrylate). However, the strong nonideal behavior obsd. for systems contg. hydrocarbons and poly(butadiene-co-acrylonitrile) shows that the effect of acrylonitrile is in excess of that expected from the copolymer compn. The perturbed hard-sphere chain (PHSC) equation of state was used to represent VLE of the copolymer solns. studied here.

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