Phase-equilibrium calculations for solutions of poly(ethylene-co-vinyl acetate) copolymers in supercritical ethylene using a cubic equation of state

被引：3

作者：

Browarzik, C ^{[1
]}

Browarzik, D ^{[1
]}

Kehlen, H ^{[1
]}

机构：

[1] Univ Halle Wittenberg, Inst Chem Phys, D-06217 Merseburg, Germany

来源：

JOURNAL OF SUPERCRITICAL FLUIDS | 2001年 / 20卷 / 01期

关键词：

cloud-point curve; continuous thermodynamics; copolymer; equation of state; polydispersity;

D O I：

10.1016/S0896-8446(00)00103-0

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The cubic equation of state proposed by Sake, 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. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：73 / 88

页数：16

共 29 条

[1] EQUILIBRIUM PHASE COMPOSITIONS OF HETEROGENEOUS COPOLYMERS [J].

BAUER, BJ .

POLYMER ENGINEERING AND SCIENCE, 1985, 25 (17) :1081-1087

[2] APPLICATION OF CONTINUOUS THERMODYNAMICS TO THE STABILITY OF POLYMER SYSTEMS .4. [J].

BERGMANN, J ;

TEICHERT, H ;

KEHLEN, H ;

RATZSCH, MT .

JOURNAL OF MACROMOLECULAR SCIENCE-PURE AND APPLIED CHEMISTRY, 1992, 29 (4-5) :371-379

[3] Calculation of the stability and of the phase equilibrium in the system polystyrene plus cyclohexane plus carbon dioxide based on equations of state [J].

Browarzik, D ;

Kowalewski, M .

FLUID PHASE EQUILIBRIA, 1999, 163 (01) :43-60

[4]

BROWARZIK D, EQUATIONS STATE FLUI

[5]

COTTERMAN RL, 1991, P ACS S KIN THERM LU, P229

[6] CALCULATION OF HIGH-PRESSURE PHASE-EQUILIBRIA OF MIXTURES OF ETHYLENE, VINYLACETATE AND AN (ETHYLENE-VINYLACETATE) COPOLYMER [J].

FINCK, U ;

WOHLFARTH, C ;

HEUER, T .

BERICHTE DER BUNSEN-GESELLSCHAFT-PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 1992, 96 (02) :179-188

[7] PHASE-EQUILIBRIA IN HIGH-PRESSURE POLYETHYLENE TECHNOLOGY [J].

FOLIE, B ;

RADOSZ, M .

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 1995, 34 (05) :1501-1516

[8] Phase equilibria of poly(ethylene-co-vinyl acetate) copolymers in subcritical and supercritical ethylene and ethylene-vinyl acetate mixtures [J].

Folie, B ;

Gregg, C ;

Luft, G ;

Radosz, M .

FLUID PHASE EQUILIBRIA, 1996, 120 (1-2) :11-37

[9] APPLICATION OF THE VAN-DER-WAALS-EQUATION OF STATE TO POLYMERS .3. CORRELATION AND PREDICTION OF UPPER CRITICAL SOLUTION TEMPERATURES FOR POLYMER-SOLUTIONS [J].

HARISMIADIS, VI ;

KONTOGEORGIS, GM ;

SARAIVA, A ;

FREDENSLUND, A ;

TASSIOS, DP .

FLUID PHASE EQUILIBRIA, 1994, 100 :63-102

[10] APPLICATION OF THE VAN-DER-WAALS-EQUATION OF STATE TO POLYMERS .2. PREDICTION [J].

HARISMIADIS, VI ;

KONTOGEORGIS, GM ;

FREDENSLUND, A ;

TASSIOS, DP .

FLUID PHASE EQUILIBRIA, 1994, 96 :93-117

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