Synthesis and gas permeation properties of a novel thermally-rearranged polybenzoxazole made from an intrinsically microporous hydroxyl-functionalized triptycene-based polyimide precursor

Handle URI:
http://hdl.handle.net/10754/624887
Title:
Synthesis and gas permeation properties of a novel thermally-rearranged polybenzoxazole made from an intrinsically microporous hydroxyl-functionalized triptycene-based polyimide precursor
Authors:
Alghunaimi, Fahd; Ghanem, Bader ( 0000-0002-2044-2434 ) ; Wang, Yingge; Salinas, Octavio ( 0000-0003-0653-660X ) ; Alaslai, Nasser Y. ( 0000-0002-4302-8711 ) ; Pinnau, Ingo ( 0000-0003-3040-9088 )
Abstract:
A hydroxyl-functionalized triptycene-based polyimide of intrinsic microporosity (TDA1-APAF) was converted to a polybenzoxazole (PBO) by heat treatment at 460 °C under nitrogen atmosphere. TDA1-APAF treated for 15 min (TR 460) resulted in a PBO conversion of 95% based on a theoretical weight loss of 11.7 wt% of the polyimide precursor. The BET surface area of the TR 460 (680 m2 g−1) was significantly higher than that of the TDA1-APAF polyimide (260 m2 g−1) as determined by nitrogen adsorption at −196 °C. Heating TDA1-APAF for 30 min (TRC 460) resulted in a weight loss of 13.5 wt%, indicating full conversion to PBO and partial main-chain degradation. The TR 460 membrane displayed excellent O2 permeability of 311 Barrer coupled with an O2/N2 selectivity of 5.4 and CO2 permeability of 1328 Barrer with a CO2/CH4 selectivity of 27. Interestingly, physical aging over 150 days resulted in enhanced O2/N2 selectivity of 6.3 with an O2 permeability of 185 Barrer. The novel triptycene-based TR 460 PBO outperformed all previously reported APAF-polyimide-based PBOs with gas permeation performance close to recently reported polymers located on the 2015 O2/N2 upper bound. Based on this study, thermally-rearranged membranes from hydroxyl-functionalized triptycene-based polyimides are promising candidate membrane materials for air separation, specifically in applications where space and weight of membrane systems are of utmost importance such as nitrogen production for inert atmospheres in fuel lines and tanks on aircrafts and off-shore oil- or natural gas platforms. Mixed-gas permeation experiments also demonstrated good performance of the TR 460 membrane for natural gas sweetening with a CO2 permeability of ∼1000 Barrer and CO2/CH4 selectivity of 22 at a typical CO2 wellhead partial pressure of 10 bar.
KAUST Department:
Advanced Membranes and Porous Materials Research Center; Chemical and Biological Engineering Program; Physical Sciences and Engineering (PSE) Division
Citation:
Alghunaimi F, Ghanem B, Wang Y, Salinas O, Alaslai N, et al. (2017) Synthesis and gas permeation properties of a novel thermally-rearranged polybenzoxazole made from an intrinsically microporous hydroxyl-functionalized triptycene-based polyimide precursor. Polymer. Available: http://dx.doi.org/10.1016/j.polymer.2017.06.006.
Publisher:
Elsevier BV
Journal:
Polymer
Issue Date:
6-Jun-2017
DOI:
10.1016/j.polymer.2017.06.006
Type:
Article
ISSN:
0032-3861
Sponsors:
The research reported in this publication was supported by funding from King Abdullah University of Science and Technology.
Additional Links:
http://www.sciencedirect.com/science/article/pii/S0032386117305669
Appears in Collections:
Articles; Advanced Membranes and Porous Materials Research Center; Physical Sciences and Engineering (PSE) Division; Chemical and Biological Engineering Program

Full metadata record

DC FieldValue Language
dc.contributor.authorAlghunaimi, Fahden
dc.contributor.authorGhanem, Baderen
dc.contributor.authorWang, Yinggeen
dc.contributor.authorSalinas, Octavioen
dc.contributor.authorAlaslai, Nasser Y.en
dc.contributor.authorPinnau, Ingoen
dc.date.accessioned2017-06-08T09:42:44Z-
dc.date.available2017-06-08T09:42:44Z-
dc.date.issued2017-06-06en
dc.identifier.citationAlghunaimi F, Ghanem B, Wang Y, Salinas O, Alaslai N, et al. (2017) Synthesis and gas permeation properties of a novel thermally-rearranged polybenzoxazole made from an intrinsically microporous hydroxyl-functionalized triptycene-based polyimide precursor. Polymer. Available: http://dx.doi.org/10.1016/j.polymer.2017.06.006.en
dc.identifier.issn0032-3861en
dc.identifier.doi10.1016/j.polymer.2017.06.006en
dc.identifier.urihttp://hdl.handle.net/10754/624887-
dc.description.abstractA hydroxyl-functionalized triptycene-based polyimide of intrinsic microporosity (TDA1-APAF) was converted to a polybenzoxazole (PBO) by heat treatment at 460 °C under nitrogen atmosphere. TDA1-APAF treated for 15 min (TR 460) resulted in a PBO conversion of 95% based on a theoretical weight loss of 11.7 wt% of the polyimide precursor. The BET surface area of the TR 460 (680 m2 g−1) was significantly higher than that of the TDA1-APAF polyimide (260 m2 g−1) as determined by nitrogen adsorption at −196 °C. Heating TDA1-APAF for 30 min (TRC 460) resulted in a weight loss of 13.5 wt%, indicating full conversion to PBO and partial main-chain degradation. The TR 460 membrane displayed excellent O2 permeability of 311 Barrer coupled with an O2/N2 selectivity of 5.4 and CO2 permeability of 1328 Barrer with a CO2/CH4 selectivity of 27. Interestingly, physical aging over 150 days resulted in enhanced O2/N2 selectivity of 6.3 with an O2 permeability of 185 Barrer. The novel triptycene-based TR 460 PBO outperformed all previously reported APAF-polyimide-based PBOs with gas permeation performance close to recently reported polymers located on the 2015 O2/N2 upper bound. Based on this study, thermally-rearranged membranes from hydroxyl-functionalized triptycene-based polyimides are promising candidate membrane materials for air separation, specifically in applications where space and weight of membrane systems are of utmost importance such as nitrogen production for inert atmospheres in fuel lines and tanks on aircrafts and off-shore oil- or natural gas platforms. Mixed-gas permeation experiments also demonstrated good performance of the TR 460 membrane for natural gas sweetening with a CO2 permeability of ∼1000 Barrer and CO2/CH4 selectivity of 22 at a typical CO2 wellhead partial pressure of 10 bar.en
dc.description.sponsorshipThe research reported in this publication was supported by funding from King Abdullah University of Science and Technology.en
dc.publisherElsevier BVen
dc.relation.urlhttp://www.sciencedirect.com/science/article/pii/S0032386117305669en
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Polymer. 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 Polymer, [, , (2017-06-06)] DOI: 10.1016/j.polymer.2017.06.006 . © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectGas separationsen
dc.subjectPolyimideen
dc.subjectTriptyceneen
dc.subjectThermal rearrangementen
dc.subjectPolybenzoxazoleen
dc.titleSynthesis and gas permeation properties of a novel thermally-rearranged polybenzoxazole made from an intrinsically microporous hydroxyl-functionalized triptycene-based polyimide precursoren
dc.typeArticleen
dc.contributor.departmentAdvanced Membranes and Porous Materials Research Centeren
dc.contributor.departmentChemical and Biological Engineering Programen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalPolymeren
dc.eprint.versionPost-printen
kaust.authorAlghunaimi, Fahden
kaust.authorGhanem, Baderen
kaust.authorWang, Yinggeen
kaust.authorSalinas, Octavioen
kaust.authorAlaslai, Nasser Y.en
kaust.authorPinnau, Ingoen
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