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Miscibility of polymer blends with engineering models
Author(s) -
Harismiadis Vassilis I.,
van Bergen A. R. D.,
Saraiva Ana,
Kontogeorgis Georgios M.,
Fredenslund Aage,
Tassios Dimitrios P.
Publication year - 1996
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690421117
Subject(s) - miscibility , van der waals force , thermodynamics , flory–huggins solution theory , unifac , equation of state , lower critical solution temperature , chemistry , polymer blend , group contribution method , polymer , work (physics) , binary number , phase (matter) , physics , phase equilibrium , organic chemistry , molecule , mathematics , arithmetic , copolymer
The miscibility behavior of polymer blends that do not exhibit strong specific interactions is examined. Phase equilibrium calculations are presented with the van der Waals equation of state and three group‐contribution models (UNIFAC, Entropic‐FV, and GC‐Flory). Performance of these models is also compared. The van der Waals equation of state was recently shown to accurately correlate and predict vapor–liquid and liquid–liquid equilibria for binary polymer/solven solutions. In this work, it is demonstrated that it correlates the upper critical solution behavior of polymer blends with excellent accuracy using the usual mixing and combining rules and a single temperature‐ and composition‐independent binary interaction parameter. This interaction parameter can be predicted via a generalized expression that uses only the pure component equation‐of‐state parameters. Using this generalized expression, the upper critical solution temperature can be predicted with an average error of less than 45°C. The van der Waals equation of state can correlate the lower critical solution behavior of polymer blends, using an interaction parameter that is a linear function of temperature. The UNIFAC and Entropic‐FV models, in general, are able to predict qualitatively the phase behavior of polymer blends, but quantitative predictions of the critical solution temperatures are not achieved. The GC‐Flory equation of state fails to predict the upper critical solution behavior in polymer blends.