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An Extension of Cubic Equations of State to Vapor-liquid Equilibria in Polymer-solvent Mixtures by Hasan Orbey; Chau-Chyun Chen; Costas P. Bokis is a Engineering article available to read on EtoBox.

What is An Extension of Cubic Equations of State to Vapor-liquid Equilibria in Polymer-solvent Mixtures about?

Cubic equations of state (EOS) are extended to describe polymer-solvent vapor-liquid equilibria (VLE). The solvents are described the conventional way using critical parameters. To describe the pure polymers, only the weight-average molecular weight is necessary, though number-average molecular weight, polydispersity and melt density can be incorporated if desired. To extend the model to mixtures, a mixing rule that combines EOS with excess energy models is used. In this formulation, the excess Gibbs energy term is considered in two parts: the classical Flory term for the entropic contributions and a residual term that takes care of specific interactions between the solvent and the polymer. For athermal mixtures that exhibit no such interactions+ the residual term drops out and the model becomes completely predictive. Otherwise, ['or residual contributions, depending upon the complexity of specific molecular interactions anticipated in the mixture, either a single parameter Flory expression or a two-parameter NRTL equation can be used. We conclude that the simple cubic EOS approach presented here is easy to use, yet competes successfully with more sophisticated EOS models developed

Who reads An Extension of Cubic Equations of State to Vapor-liquid Equilibria in Polymer-solvent Mixtures?

Author

Hasan Orbey; Chau-Chyun Chen; Costas P. Bokis

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0378-3812)

Published

1998

Language

EN

Field

Engineering (Physical Sciences)