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Phase-equilibrium Calculations for Solutions of Poly(ethylene-co-vinyl Acetate) Copolymers in Supercritical Ethylene Using a Cubic Equation of State by C. Browarzik; D. Browarzik; H. Kehlen is a Engineering article available to read on EtoBox.

What is Phase-equilibrium Calculations for Solutions of Poly(ethylene-co-vinyl Acetate) Copolymers in Supercritical Ethylene Using a Cubic Equation of State about?

The cubic equation of state proposed by Sako, Wu and Prausnitz (SWP-EOS) is used to calculate the phase equilibrium for quasibinary solutions of poly(ethylene-co-vinyl acetate) copolymers (EVA) in supercritical ethylene. The copolymer is considered to be polydisperse with respect to molecular weight and, additionally, with respect to chemical composition. Equations for the cloud-point curve and for the shadow curve are derived with the aid of continuous thermodynamics incorporating both kinds of polydispersity by the use of a bivariate distribution function. The calculations are performed for EVA +ethylene systems with different averages of molecular weight and chemical composition of the copolymer at five temperatures (393-473 K). The binary interaction parameter is found to be a function of the temperature and of the chemical composition of the copolymer but to be independent of the molecular weight. Predictions of cloud-point curves and shadow curves of EVA + ethylene systems that were not included in parameter fit are very successful.

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Author

C. Browarzik; D. Browarzik; H. Kehlen

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0896-8446)

Published

2001

Language

EN

Field

Engineering (Physical Sciences)