Application of the van der Waals equation of state to polymers III. Correlation and prediction of upper critical solution temperatures for polymer solutions

Harismiadis, VI; Kontogeorgis, GM; Saraiva, A; Fredenslund, A; Tassios, DP

dc.contributor.author	Harismiadis, VI	en
dc.contributor.author	Kontogeorgis, GM	en
dc.contributor.author	Saraiva, A	en
dc.contributor.author	Fredenslund, A	en
dc.contributor.author	Tassios, DP	en
dc.date.accessioned	2014-03-01T01:42:30Z
dc.date.available	2014-03-01T01:42:30Z
dc.date.issued	1994	en
dc.identifier.issn	03783812	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/23861
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0028501831&partnerID=40&md5=3bfef5c6d3237f75178c57d4eb4e1f26	en
dc.subject	Application	en
dc.subject	Equation of state	en
dc.subject	Liquid-liquid equilibria	en
dc.subject	Mixing rules	en
dc.subject	Polymer solutions	en
dc.subject	Theory	en
dc.subject.other	Correlation methods	en
dc.subject.other	Curve fitting	en
dc.subject.other	Mixing	en
dc.subject.other	Parameter estimation	en
dc.subject.other	Phase equilibria	en
dc.subject.other	Polymers	en
dc.subject.other	Solutions	en
dc.subject.other	Solvents	en
dc.subject.other	Van der Waals forces	en
dc.subject.other	Berthelot combining rule	en
dc.subject.other	Critical properties	en
dc.subject.other	Equations of state of liquids	en
dc.subject.other	Equilibria	en
dc.subject.other	Liquid/Liquid Mixtures	en
dc.subject.other	Mixing	en
dc.title	Application of the van der Waals equation of state to polymers III. Correlation and prediction of upper critical solution temperatures for polymer solutions	en
heal.type	journalArticle	en
heal.publicationDate	1994	en
heal.abstract	The van der Waals equation of state is used for correlation (using a single binary interaction parameter) and prediction of liquid-liquid equilibrium in many mixtures including a solvent and a polymer. The equation of state parameters for the polymer are estimated from experimental volumetric data at low pressures. For the solvent, the equation of state parameters are estimated via the classical method, i.e. using the critical properties of the solvent and generalized expressions of the acentric factor. When extended to mixtures, the van der Waals one-fluid mixing rules along with the Berthelot combining rule for the molecular cross energy parameter are used. The arithmetic mean combining rule is used for the cross co-volume parameter. A correction to the Berthelot combining rule which is obtained from vapor-liquid equilibrium data of polymer solutions is used for predicting the upper critical solution temperatures for many different binary polymer solutions, including polar and non-polar systems. The results are remarkably successful. Typically, the difference between the predicted and the experimental upper critical solution temperatures is less than twenty degrees. Further, in all cases, correlation is achieved in an easy and straightforward way without difficulty and excellent results are obtained. Unlike other theories and models, the van der Waals equation of state is capable of predicting the flatness of the coexistence curves, which often occurs in polymer solutions. © 1994.	en
heal.journalName	Fluid Phase Equilibria	en
dc.identifier.volume	100	en
dc.identifier.issue	C	en
dc.identifier.spage	63	en
dc.identifier.epage	102	en