Effects of Supercritical CO 2 Conditioning on Cross-Linked Polyimide Membranes

Handle URI:
http://hdl.handle.net/10754/598087
Title:
Effects of Supercritical CO 2 Conditioning on Cross-Linked Polyimide Membranes
Authors:
Kratochvil, Adam M.; Koros, William J.
Abstract:
The effects of supercritical CO2 (scCO2) conditioning on high-performance cross-linked polyimide membranes is examined through gas permeation and sorption experiments. Under supercritical conditions, the cross-linked polymers do not exhibit a structural reorganization of the polymer matrix that was observed in the non-cross-linkable, free acid polymer. Pure gas permeation isotherms and mixed gas permeabilities and selectivities show the cross-linked polymers to be much more stable to scCO2 conditioning than the free acid polymer. In fact, following scCO2 conditioning, the mixed gas CO2 permeabilities of the cross-linked polymers increased while the CO2/CH4 separation factors remained relatively unchanged. This response highlights the stability and high performance of these cross-linked membranes in aggressive environments. In addition, this response reveals the potential for the preconditioning of cross-linked polymer membranes to enhance productivity without sacrificing efficiency in practical applications which, in effect, provides another tool to 'tune' membrane properties for a given separation. Finally, the dual mode model accurately describes the sorption and dilation characteristics of the cross-linked polymers. The changes in the dual mode sorption model parameters before and after the scCO2 exposure also provide insights into the alterations in the different glassy samples due to the cross-linking and scCO2 exposure. © 2010 American Chemical Society.
Citation:
Kratochvil AM, Koros WJ (2010) Effects of Supercritical CO 2 Conditioning on Cross-Linked Polyimide Membranes . Macromolecules 43: 4679–4687. Available: http://dx.doi.org/10.1021/ma100535h.
Publisher:
American Chemical Society (ACS)
Journal:
Macromolecules
Issue Date:
25-May-2010
DOI:
10.1021/ma100535h
Type:
Article
ISSN:
0024-9297; 1520-5835
Sponsors:
The authors acknowledge support by the United States Department of Energy (Grant DE-FG0395ER 14538) and Award KUS-11-011-21 made by King Abdullah University of Science and Technology (KAUST) for this research.
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Full metadata record

DC FieldValue Language
dc.contributor.authorKratochvil, Adam M.en
dc.contributor.authorKoros, William J.en
dc.date.accessioned2016-02-25T13:12:25Zen
dc.date.available2016-02-25T13:12:25Zen
dc.date.issued2010-05-25en
dc.identifier.citationKratochvil AM, Koros WJ (2010) Effects of Supercritical CO 2 Conditioning on Cross-Linked Polyimide Membranes . Macromolecules 43: 4679–4687. Available: http://dx.doi.org/10.1021/ma100535h.en
dc.identifier.issn0024-9297en
dc.identifier.issn1520-5835en
dc.identifier.doi10.1021/ma100535hen
dc.identifier.urihttp://hdl.handle.net/10754/598087en
dc.description.abstractThe effects of supercritical CO2 (scCO2) conditioning on high-performance cross-linked polyimide membranes is examined through gas permeation and sorption experiments. Under supercritical conditions, the cross-linked polymers do not exhibit a structural reorganization of the polymer matrix that was observed in the non-cross-linkable, free acid polymer. Pure gas permeation isotherms and mixed gas permeabilities and selectivities show the cross-linked polymers to be much more stable to scCO2 conditioning than the free acid polymer. In fact, following scCO2 conditioning, the mixed gas CO2 permeabilities of the cross-linked polymers increased while the CO2/CH4 separation factors remained relatively unchanged. This response highlights the stability and high performance of these cross-linked membranes in aggressive environments. In addition, this response reveals the potential for the preconditioning of cross-linked polymer membranes to enhance productivity without sacrificing efficiency in practical applications which, in effect, provides another tool to 'tune' membrane properties for a given separation. Finally, the dual mode model accurately describes the sorption and dilation characteristics of the cross-linked polymers. The changes in the dual mode sorption model parameters before and after the scCO2 exposure also provide insights into the alterations in the different glassy samples due to the cross-linking and scCO2 exposure. © 2010 American Chemical Society.en
dc.description.sponsorshipThe authors acknowledge support by the United States Department of Energy (Grant DE-FG0395ER 14538) and Award KUS-11-011-21 made by King Abdullah University of Science and Technology (KAUST) for this research.en
dc.publisherAmerican Chemical Society (ACS)en
dc.titleEffects of Supercritical CO 2 Conditioning on Cross-Linked Polyimide Membranesen
dc.typeArticleen
dc.identifier.journalMacromoleculesen
dc.contributor.institutionGeorgia Institute of Technology, Atlanta, United Statesen
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