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Type: Artigo de periódico
Title: Phase diagrams of the system tetrahydrofuran/gamma-butyrolactone poly(ether imide) and determination of interaction parameters
Author: Maggioni, JF
Nunes, SP
Pires, ATN
Eich, A
Horst, R
Wolf, BA
Abstract: The thermodynamic interactions in the ternary mixture tetrahydrofuran/gamma-butyrolactone/poly(ether imide) (THF/ gamma-BL/PEI) are investigated from 30 to 50 degrees C. This is a membrane-forming system with a high He-selectivity. Cloud point measurements show that the two binary polymer solutions THF/PEI and gamma-BL/PET exhibit miscibility gaps which close towards the centre of the ternary phase diagram where the mixtures become homogeneous (cosolvency). Vapour pressures were determined for the subsystem THF/gamma-BL. For the theoretical calculations the Gibbs energy of mixing is formulated according to the Flory-Huggins theory and the interaction parameter chi(THF/gamma-BL) calculated from the vapour pressures. The adjustment of theoretical phase diagrams to the experimental data (cloud point curves, tie lines and critical points) gives access to chi(THF/PEI) and chi(gamma-BL/PEI) For a satisfactory representation of the liquid-liquid demixing, a concentration dependent chi(THF/PEI) is required, whereas concentration independent values for chi(THF gamma-BL) and chi(gamma-BL/PEI) suffice. (C) 1998 Elsevier Science Ltd. All rights reserved.
Subject: Flory-Huggins parameter
liquid-liquid demixing
ternary mixture
Country: Inglaterra
Editor: Elsevier Sci Ltd
Rights: fechado
Identifier DOI: 10.1016/S0032-3861(97)10064-7
Date Issue: 1998
Appears in Collections:Unicamp - Artigos e Outros Documentos

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