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Open AccessArticle

Synthesis of Imidazolium based PILs and Investigation of Their Blend Membranes for Gas Separation

1
Department of Chemistry, University of Patras, GR 26504 Patras, Greece
2
Foundation for Research and Technology, Institute of Chemical Engineering Sciences (FORTH/ICE-HT), GR 26504 Patras, Greece
*
Author to whom correspondence should be addressed.
Membranes 2019, 9(12), 164; https://doi.org/10.3390/membranes9120164
Received: 19 November 2019 / Revised: 28 November 2019 / Accepted: 29 November 2019 / Published: 3 December 2019
(This article belongs to the Special Issue Membranes for Gas Separation)
Polymeric (ionic liquid) (PIL) copolymers bearing cationic imidazolium pendants and polar acrylic acid groups (P(VBCImY-co-AAx)), which both favor the interaction with CO2 molecules, have been synthesized and blended with film forming, high glass transition temperature aromatic polyether-based pyridinium PILs (PILPyr). The blend membranes based on the above combination have been prepared and characterized in respect to their thermal and morphological behavior as well as to their gas separation properties. The used copolymers and blends showed a wide range of glass transition temperatures from 32 to 286 °C, while blends exhibited two phase morphology despite the presence of polar groups in the blend components that could participate in specific interactions. Finally, the membranes were studied in terms of their gas separation behavior. It revealed that blend composition, counter anion type and acrylic acid molar percentage affect the gas separation properties. In particular, PILPyr-TFSI/P(VBCImTFSI-co-AA20) blend with 80/20 composition shows CO2 permeability of 7.00 Barrer and quite high selectivity of 103 for the CO2/CH4 gas pair. Even higher CO2/CH4. selectivity of 154 was achieved for PILPyr-BF4/P(VBCImBF4-co-AA10) blend with composition 70/30. View Full-Text
Keywords: PILs; blends; membranes, gas separation; pyridinium based PIL (PILPyr); imidazolium based PILs PILs; blends; membranes, gas separation; pyridinium based PIL (PILPyr); imidazolium based PILs
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MDPI and ACS Style

Chouliaras, T.; Vollas, A.; Ioannides, T.; Deimede, V.; Kallitsis, J. Synthesis of Imidazolium based PILs and Investigation of Their Blend Membranes for Gas Separation. Membranes 2019, 9, 164.

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