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Polymers 2018, 10(8), 912; https://doi.org/10.3390/polym10080912

New Pyridinium Type Poly(Ionic Liquids) as Membranes for CO2 Separation

1
Department of Chemistry, University of Patras, GR-26504 Patras, Greece
2
Foundation for Research and Technology-Hellas, Institute of Chemical Engineering Sciences (FORTH/ICE-HT), GR-26504 Patras, Greece
*
Author to whom correspondence should be addressed.
Received: 8 June 2018 / Revised: 7 August 2018 / Accepted: 9 August 2018 / Published: 13 August 2018
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Abstract

New pyridinium based PILs have been prepared by modification of their precursors based on high molecular weight aromatic polyethers bearing main chain pyridine units. The proposed methodology involves the conversion of the precursors to their ionic analogues via N-methylation reaction, followed by anion exchange methathesis reaction to result in PILs with the desirable anions (tetrafluoroborate and bis(trifluoromethylsulfonyl)imide). These PILs show excellent thermal stability, excellent mechanical properties, and most importantly can form very thin, free standing films with minimum thickness of 3 μm. As expected, the PIL containing the TFSI anion showed improved CO2 and CH4 permeabilities compared to its analogue containing the BF4. PIL-IL composites membranes have also been prepared using the same PIL and different percentages of pyridinium based IL where it was shown that the membrane with the highest IL weight percentage (45 wt %) showed the highest CO2 permeability (11.8 Barrer) and a high CO2/CH4 ideal selectivity of 35 at room temperature. View Full-Text
Keywords: gas separation; polymeric ionic liquids; pyridinium; PIL-IL composite membranes gas separation; polymeric ionic liquids; pyridinium; PIL-IL composite membranes
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Vollas, A.; Chouliaras, T.; Deimede, V.; Ioannides, T.; Kallitsis, J. New Pyridinium Type Poly(Ionic Liquids) as Membranes for CO2 Separation. Polymers 2018, 10, 912.

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