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Issue 1, 2017
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Click-based porous cationic polymers for enhanced carbon dioxide capture

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Abstract

Imidazolium-based porous cationic polymers were synthesized using an innovative and facile approach, which takes advantage of the Debus–Radziszewski reaction to obtain meso-/microporous polymers following click-chemistry principles. In the obtained set of materials, click-based porous cationic polymers have the same cationic backbone, whereas they bear the commonly used anions of imidazolium poly(ionic liquid)s. These materials show hierarchical porosity and a good specific surface area. Furthermore, their chemical structure was extensively characterized using ATR-FTIR and SS-NMR spectroscopies, and HR-MS. These polymers show good performance towards carbon dioxide sorption, especially those possessing the acetate anion. This polymer has an uptake of 2 mmol g−1 of CO2 at 1 bar and 273 K, a value which is among the highest recorded for imidazolium poly(ionic liquid)s. These polymers were also modified in order to introduce N-heterocyclic carbenes along the backbone. Carbon dioxide loading in the carbene-containing polymer is in the same range as that of the non-modified versions, but the nature of the interaction is substantially different. The combined use of in situ FTIR spectroscopy and micro-calorimetry evidenced a chemisorption phenomenon that brings about the formation of an imidazolium carboxylate zwitterion.

Graphical abstract: Click-based porous cationic polymers for enhanced carbon dioxide capture

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Supplementary files

Article information


Submitted
02 Oct 2016
Accepted
09 Nov 2016
First published
09 Nov 2016

J. Mater. Chem. A, 2017,5, 372-383
Article type
Paper

Click-based porous cationic polymers for enhanced carbon dioxide capture

A. Dani, V. Crocellà, C. Magistris, V. Santoro, J. Yuan and S. Bordiga, J. Mater. Chem. A, 2017, 5, 372
DOI: 10.1039/C6TA08574A

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