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Ternary phase equilibria of tetrahydrofuran‐polystyrene‐polytetrahydrofuran
Author(s) -
Geveke David J.,
Bernardin Frederick E.,
Danner Ronald P.
Publication year - 1993
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1993.070500206
Subject(s) - uniquac , tetrahydrofuran , polystyrene , ternary operation , flory–huggins solution theory , polymer , materials science , miscibility , ternary numeral system , thermodynamics , polymer chemistry , solvent , phase diagram , phase (matter) , polymer science , chemistry , organic chemistry , activity coefficient , physics , composite material , computer science , aqueous solution , non random two liquid model , programming language
Phase diagrams including tie lines for three ternary solvent‐polymer‐polymer systems consisting of tetrahydrofuran‐polystyrene‐polytetrahydrofuran at 30°C have been obtained using size exclusion chromatography. The effect of molecular weight on polymer‐polymer compatibility has been investigated. A liquid‐liquid equilibria (LLE) database has been used to compare UNIQUAC and a modified Flory‐Huggins model with respect to their ability to correlate LLE data. Both models contain six adjustable parameters. As previously observed in the literature, the estimation of the UNIQUAC parameters is troublesome due to the model's complexity and the intercorrelation of the parameters. On the basis of better performance and ease of use, the Flory‐Huggins model is recommended. The Flory‐Huggins model is capable of accurately describing LLE of systems which exhibit quite complex tie line behavior. © 1993 John Wiley & Sons, Inc.