Effects of casting and post casting annealing on xylene isomer transport properties of Torlon® 4000T films

Handle URI:
http://hdl.handle.net/10754/598071
Title:
Effects of casting and post casting annealing on xylene isomer transport properties of Torlon® 4000T films
Authors:
Chafin, Raymond; Lee, Jong Suk; Koros, William J.
Abstract:
Procedures for Torlon® 4000T membrane formation were developed to provide attractive and repeatable xylene separation properties. Torlon® 4000T membrane films cast by our method were investigated in terms of thermally induced imidization, molecular weight enhancement, and solvent removal. After development of the Torlon® 4000T casting procedure, pervaporation of a xylene mixture (i.e. 30% para-xylene, 30% meta-xylene, 30% ortho-xylene, and 10% ethylbenzene) was performed in both Torlon® 4000T and post casting annealed Torlon® 4000T films. The xylene pervaporation in annealed Torlon® 4000T film at 200°C gave a permeability of 0.25 Barrer and a selectivity of 3.1 (para/ortho) and 2.1 (para/meta) respectively. A so-called " permeability collapse" reflecting an accelerated reduction in the free volume is consistent with significant temperature-induced changes in the films observed after thermal annealing at 300°C. This conditioning effect is induced by a combination of heat treatment and the presence of the interacting aromatic penetrants. Optical methods were used to verify that the density of annealed samples exposed to xylene for 5 days eventually increased, suggesting that the membrane is originally swollen upon initial xylene exposure, and then relaxes to a more densified, and more discriminating state. © 2010 Elsevier Ltd.
Citation:
Chafin R, Lee JS, Koros WJ (2010) Effects of casting and post casting annealing on xylene isomer transport properties of Torlon® 4000T films. Polymer 51: 3462–3471. Available: http://dx.doi.org/10.1016/j.polymer.2010.05.028.
Publisher:
Elsevier BV
Journal:
Polymer
Issue Date:
Jul-2010
DOI:
10.1016/j.polymer.2010.05.028
Type:
Article
ISSN:
0032-3861
Sponsors:
The authors would like to acknowledge financial support from BP, The Coca Cola Company, and Award No. KUS-I1-011-21 made by King Abdullah University of Science and Technology (KAUST). Also, we would like to convey special thanks to Chuck Hoppin for his assistance in making the viscometry measurements.
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Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorChafin, Raymonden
dc.contributor.authorLee, Jong Suken
dc.contributor.authorKoros, William J.en
dc.date.accessioned2016-02-25T13:12:06Zen
dc.date.available2016-02-25T13:12:06Zen
dc.date.issued2010-07en
dc.identifier.citationChafin R, Lee JS, Koros WJ (2010) Effects of casting and post casting annealing on xylene isomer transport properties of Torlon® 4000T films. Polymer 51: 3462–3471. Available: http://dx.doi.org/10.1016/j.polymer.2010.05.028.en
dc.identifier.issn0032-3861en
dc.identifier.doi10.1016/j.polymer.2010.05.028en
dc.identifier.urihttp://hdl.handle.net/10754/598071en
dc.description.abstractProcedures for Torlon® 4000T membrane formation were developed to provide attractive and repeatable xylene separation properties. Torlon® 4000T membrane films cast by our method were investigated in terms of thermally induced imidization, molecular weight enhancement, and solvent removal. After development of the Torlon® 4000T casting procedure, pervaporation of a xylene mixture (i.e. 30% para-xylene, 30% meta-xylene, 30% ortho-xylene, and 10% ethylbenzene) was performed in both Torlon® 4000T and post casting annealed Torlon® 4000T films. The xylene pervaporation in annealed Torlon® 4000T film at 200°C gave a permeability of 0.25 Barrer and a selectivity of 3.1 (para/ortho) and 2.1 (para/meta) respectively. A so-called " permeability collapse" reflecting an accelerated reduction in the free volume is consistent with significant temperature-induced changes in the films observed after thermal annealing at 300°C. This conditioning effect is induced by a combination of heat treatment and the presence of the interacting aromatic penetrants. Optical methods were used to verify that the density of annealed samples exposed to xylene for 5 days eventually increased, suggesting that the membrane is originally swollen upon initial xylene exposure, and then relaxes to a more densified, and more discriminating state. © 2010 Elsevier Ltd.en
dc.description.sponsorshipThe authors would like to acknowledge financial support from BP, The Coca Cola Company, and Award No. KUS-I1-011-21 made by King Abdullah University of Science and Technology (KAUST). Also, we would like to convey special thanks to Chuck Hoppin for his assistance in making the viscometry measurements.en
dc.publisherElsevier BVen
dc.subjectPervaporationen
dc.subjectTorlon® 4000Ten
dc.subjectXyleneen
dc.titleEffects of casting and post casting annealing on xylene isomer transport properties of Torlon® 4000T filmsen
dc.typeArticleen
dc.identifier.journalPolymeren
dc.contributor.institutionInha University, Incheon, Incheon, South Koreaen
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