Phase diagrams of the system tetrahydrofuran/gamma-butyrolactone poly(ether imide) and determination of interaction parameters

dc.creatorMaggioni, JF
dc.creatorNunes, SP
dc.creatorPires, ATN
dc.creatorEich, A
dc.creatorHorst, R
dc.creatorWolf, BA
dc.date1998
dc.dateOCT
dc.date2014-12-02T16:26:46Z
dc.date2015-11-26T17:40:06Z
dc.date2014-12-02T16:26:46Z
dc.date2015-11-26T17:40:06Z
dc.date.accessioned2018-03-29T00:21:45Z
dc.date.available2018-03-29T00:21:45Z
dc.identifierPolymer. Elsevier Sci Ltd, v. 39, n. 21, n. 5133, n. 5138, 1998.
dc.identifier0032-3861
dc.identifierWOS:000075216800018
dc.identifier10.1016/S0032-3861(97)10064-7
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/59436
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/59436
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/59436
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1286631
dc.descriptionThe 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.
dc.description39
dc.description21
dc.description5133
dc.description5138
dc.languageen
dc.publisherElsevier Sci Ltd
dc.publisherOxford
dc.publisherInglaterra
dc.relationPolymer
dc.relationPolymer
dc.rightsfechado
dc.rightshttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dc.sourceWeb of Science
dc.subjectFlory-Huggins parameter
dc.subjectliquid-liquid demixing
dc.subjectternary mixture
dc.subjectCosolvency
dc.subjectBlends
dc.titlePhase diagrams of the system tetrahydrofuran/gamma-butyrolactone poly(ether imide) and determination of interaction parameters
dc.typeArtículos de revistas


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