Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/104295
Type: Artigo de periódico
Title: Vapor-liquid Equilibrium Of Polymer + Solvent Systems: Experimental Data And Thermodynamic Modeling
Author: Se R.A.G.
Aznar M.
Abstract: In this work, experimental vapor-liquid equilibrium (VLE) data for binary systems polymer + solvent were obtained using a gravimetric sorption apparatus. The studied systems were benzene + polystyrene, hexane + polystyrene, benzene + poly(methyl methacrylate), benzene + poly(ethyl methacrylate), hexane + poly(vinyl chlorate) and water + poly(vinyl chlorate), in the range of 30-40 °C. The experimental data were modeled with two group contribution models for the activity coefficient, Elbro-FV and UNIFAC-Zhong; the latter method considers the free-volume of molecules of high molecular weight, such as polymers. UNIFAC groups in the literature as well as new groups that were proposed for the monomers were used. The necessary energy interaction parameters between these groups were estimated. There were observed mean deviations between experimental and calculated mass fractions of about 8.5% with Elbro-FV, and about 17% with UNIFAC-Zhong when original groups were used, while there were observed mean deviations of about 7% with Elbro-FV and about 16% with UNIFAC-Zhong when new groups were used. The Elbro-FV model represents the experimental data with better precision in both cases; on the other hand, the data were better correlated with both models when new groups were used. © 2007 Elsevier Ltd. All rights reserved.
Editor: 
Rights: fechado
Identifier DOI: 10.1016/j.polymer.2007.07.027
Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-34548508708&partnerID=40&md5=9a5e2deb9d48f434dca75116e46cc899
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

Files in This Item:
File Description SizeFormat 
2-s2.0-34548508708.pdf397.65 kBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.