Vapor-liquid equilibrium in a polysulfone-reactive plasticizer-dichloromethane system

Abstract

A piezoelectric sorption apparatus is used to study the sorption of dichloromethane (DCM) in a polysulfone (PSF), a reactive plasticizer (RPS), and a mixture containing 70 wt. % PSF and 30 wt. % RPS. A general procedure is suggested to model the sorption data in the glassy polymer. The "dual sorption" model is used to find the hole-filling and dissolution contributions for DCM sorption in PSF. The Flory-Huggins theory and the Cheng and Bonner corresponding states theory are applied to model the dissolution contribution for sorption of DCM in PSF and the sorption of DCM in RPS. The data obtained for the sorption of DCM in PSF from the piezoelectric sorption technique and the infinite dilution chromatography are compared. An extension of the Cheng and Bonner corresponding states theory to three components is proposed. The sorption of DCM in the mixture of PSF and RPS is modelled by Scott's theory and the extension of the Cheng and Bonner theory to three components to provide information about the PSF and RPS compatibility.