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Ultramicroporous polyimides with hierarchical morphology for carbon dioxide separation

Title data

Breunig, Marion ; Dorner, Melanie ; Senker, Jürgen:
Ultramicroporous polyimides with hierarchical morphology for carbon dioxide separation.
In: Journal of Materials Chemistry A. Vol. 9 (2021) Issue 21 . - pp. 12797-12806.
ISSN 2050-7496
DOI: https://doi.org/10.1039/d0ta12426e

Abstract in another language

Microporous organic polyimides are promising materials to be used as adsorbents to remove carbon dioxide from flue gases by physisorptive separation processes. Especially, ultramicroporous systems often exhibit excellent CO2 selectivities and uptakes. Ultramicroporosity is usually achieved by using small linkers, making conventional synthesis routes challenging due to the stress in the resulting networks. Using toluene as an entraining agent, we were able to synthesise two new microporous organic polyimides - MOPI-6 and MOPI-7 - with very small linker molecules. The composition of the solvent mixture m-cresol/toluene was varied and all polymers were characterised using C-13 and N-15 CP MAS NMR as well as IR spectroscopy, CHN, PXRD, TGA, SEM and physisorption. Both polymer series exhibit high crosslinking degrees, and the systems prepared in m-cresol/toluene mixtures show ultra- and supermicroporosity with CO2 uptakes comparable with values for systems reported in the literature. By preferentially adsorbing CO2, which blocks the accessible pore space for methane, these systems feature outstanding selectivity values up to 72 for CO2/CH4 mixtures. Additionally, they exhibit a sponge-like morphology resulting in unusual hierarchical porosity, which we attribute to pronounced boiling of the solvent mixture by adjusting the solvent polarity to the polymer particle surface properties. The hierarchical porosity reduces diffusion paths and thus avoids kinetic hindrances important in dynamic sorption processes used in industrial relevant applications like pressure (PSA), vacuum (VSA) or temperature swing adsorption (TSA). Thus, we consider the use of solvent mixtures with strong boiling point differences as an approach to synthesise hierarchical porous polymers, which is applicable for a wide range of porous polymers.

Further data

Item Type: Article in a journal
Refereed: Yes
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: 08 Jun 2021 07:49
Last Modified: 08 Jun 2021 09:34
URI: https://eref.uni-bayreuth.de/id/eprint/65684