Gas Permeation and Physical Aging Properties of Iptycene Diamine-Based Microporous Polyimides

Handle URI:
http://hdl.handle.net/10754/553002
Title:
Gas Permeation and Physical Aging Properties of Iptycene Diamine-Based Microporous Polyimides
Authors:
Alghunaimi, Fahd; Ghanem, Bader ( 0000-0002-2044-2434 ) ; Alaslai, Nasser Y.; Swaidan, Raja ( 0000-0002-9296-6501 ) ; Litwiller, Eric; Pinnau, Ingo ( 0000-0003-3040-9088 )
Abstract:
The synthesis and gas permeation properties of two 6FDA-dianhydride-based polyimides prepared from 2,6-diaminotriptycene (6FDA-DAT1) and its extended iptycene analog (6FDA-DAT2) are reported. The additional benzene ring on the extended triptycene moiety in 6FDA–DAT2 increases the free volume over 6FDA-DAT1 and reduces the chain packing efficiency. The BET surface area based on nitrogen adsorption in 6FDA-DAT2 (450 m2g−1) is ~40% greater than that of 6FDA-DAT1 (320 m2g−1). 6FDA-DAT1 shows a CO2 permeability of 120 Barrer and CO2/CH4 selectivity of 38, whereas 6FDA-DAT2 exhibits a 75% increase in CO2 permeability to 210 Barrer coupled with a moderate decrease in selectivity (CO2/CH4=30). Interestingly, minimal physical aging was observed over 150 days for both polymers and attributed to the high internal free volume of the shape-persistent iptycene geometries. The aged polyimides maintained CO2/CH4 selectivities of 25-35 along with high CO2 permeabilities of 90-120 Barrer up to partial CO2 pressures of 10 bar of an aggressive 50:50 CO2:CH4 mixed-gas feed, suggesting potential application in membranes for natural gas sweetening.
KAUST Department:
Advanced Membranes and Porous Materials Research Center; Physical Sciences and Engineering (PSE) Division
Citation:
Gas Permeation and Physical Aging Properties of Iptycene Diamine-Based Microporous Polyimides 2015 Journal of Membrane Science
Journal:
Journal of Membrane Science
Issue Date:
12-May-2015
DOI:
10.1016/j.memsci.2015.05.010
Type:
Article
ISSN:
03767388
Additional Links:
http://linkinghub.elsevier.com/retrieve/pii/S0376738815004214
Appears in Collections:
Articles; Advanced Membranes and Porous Materials Research Center; Physical Sciences and Engineering (PSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorAlghunaimi, Fahden
dc.contributor.authorGhanem, Baderen
dc.contributor.authorAlaslai, Nasser Y.en
dc.contributor.authorSwaidan, Rajaen
dc.contributor.authorLitwiller, Ericen
dc.contributor.authorPinnau, Ingoen
dc.date.accessioned2015-05-17T20:06:12Zen
dc.date.available2015-05-17T20:06:12Zen
dc.date.issued2015-05-12en
dc.identifier.citationGas Permeation and Physical Aging Properties of Iptycene Diamine-Based Microporous Polyimides 2015 Journal of Membrane Scienceen
dc.identifier.issn03767388en
dc.identifier.doi10.1016/j.memsci.2015.05.010en
dc.identifier.urihttp://hdl.handle.net/10754/553002en
dc.description.abstractThe synthesis and gas permeation properties of two 6FDA-dianhydride-based polyimides prepared from 2,6-diaminotriptycene (6FDA-DAT1) and its extended iptycene analog (6FDA-DAT2) are reported. The additional benzene ring on the extended triptycene moiety in 6FDA–DAT2 increases the free volume over 6FDA-DAT1 and reduces the chain packing efficiency. The BET surface area based on nitrogen adsorption in 6FDA-DAT2 (450 m2g−1) is ~40% greater than that of 6FDA-DAT1 (320 m2g−1). 6FDA-DAT1 shows a CO2 permeability of 120 Barrer and CO2/CH4 selectivity of 38, whereas 6FDA-DAT2 exhibits a 75% increase in CO2 permeability to 210 Barrer coupled with a moderate decrease in selectivity (CO2/CH4=30). Interestingly, minimal physical aging was observed over 150 days for both polymers and attributed to the high internal free volume of the shape-persistent iptycene geometries. The aged polyimides maintained CO2/CH4 selectivities of 25-35 along with high CO2 permeabilities of 90-120 Barrer up to partial CO2 pressures of 10 bar of an aggressive 50:50 CO2:CH4 mixed-gas feed, suggesting potential application in membranes for natural gas sweetening.en
dc.relation.urlhttp://linkinghub.elsevier.com/retrieve/pii/S0376738815004214en
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Journal of Membrane Science. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Membrane Science, 12 May 2015. DOI: 10.1016/j.memsci.2015.05.010en
dc.subjectPolyimides of intrinsic microporosityen
dc.subjectTriptyceneen
dc.subjectGas separationen
dc.subjectNatural gasen
dc.subjectPhysical agingen
dc.titleGas Permeation and Physical Aging Properties of Iptycene Diamine-Based Microporous Polyimidesen
dc.typeArticleen
dc.contributor.departmentAdvanced Membranes and Porous Materials Research Centeren
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalJournal of Membrane Scienceen
dc.eprint.versionPost-printen
kaust.authorGhanem, Baderen
kaust.authorAlaslai, Nasser Y.en
kaust.authorSwaidan, Rajaen
kaust.authorLitwiller, Ericen
kaust.authorPinnau, Ingoen
kaust.authorAlghunaimi, Fahden
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