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Electrospun, non-woven fiber membranes of porous polyimides with high carbon dioxide uptakes and selectivities

Title data

Breunig, Marion ; Zhu, Jian ; Ding, Chenhui ; Siegel, Renée ; Agarwal, Seema ; Senker, Jürgen:
Electrospun, non-woven fiber membranes of porous polyimides with high carbon dioxide uptakes and selectivities.
In: Microporous and Mesoporous Materials. Vol. 329 (January 2022) . - No. 111519.
ISSN 1873-3093
DOI: https://doi.org/10.1016/j.micromeso.2021.111519

Abstract in another language

Microporous organic polyimides are well suited for carbon dioxide separation from gas mixtures based on their polar surface and their tendency towards ultramicroporosity. Nevertheless, their application potential is limited due to an inherent insolubility and infusibility, preventing an easy processing into functional objects like membranes. By establishing a three-step synthesis procedure for the literature known network NPI-I, here, a solution to this challenge is demonstrated. The central step is electrospinning of a solution of the linkers tetrakis (4-aminophenyl)methane and naphthalene 1,4,5,8-tetracarboxylic dianhydride and the auxiliary polymer polyvinylpyrrolidone into a precursor fiber mat. The mat was then heated to polymerize the linkers into the polyimide. Subsequently, PVP was removed by pyrolysis obtaining a robust, flexible and self-standing membrane. The NPI-I fiber mat exhibits a remarkable microporosity with a BET surface area of 222 m(2)/g, a total pore volume of 0.121 cm(3)/g and a high amount of ultramicropores. Its CO2 uptake of 3.0 mmol/g (0 degrees C, 1 bar) and its CO2/ CH4 selectivity of about 20 (0 degrees C, 1 bar) even exceed the literature values for bulk NPI-I. This study reveals that PVP acts as a template on molecular level influencing, primarily the micropore formation, reducing the BET surface area by roughly a factor of three compared to the bulk material. In contrast, the ultramicroporosity of the porous polyimides remains mainly unaffected. We envision that this three-step synthesis can be transferred to a broad variety of porous polymers. With electrospinning the large-scale production of self-standing membranes becomes realistic rendering the application of porous polymers for gas separation more likely.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: WOS:000713001300001
Keywords: Porous polymers; Gas sorption; Processing; Hierarchical porosity
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Inorganic Chemistry III > Chair Inorganic Chemistry III - Univ.-Prof. Dr. Jürgen Senker
Research Institutions > Research Centres > Nordbayerisches Zentrum für NMR-Spektroskopie - NMR-Zentrum
Result of work at the UBT: Yes
DDC Subjects: 500 Science
500 Science > 540 Chemistry
Date Deposited: 03 Feb 2022 09:42
Last Modified: 03 Feb 2022 09:42
URI: https://eref.uni-bayreuth.de/id/eprint/68574