Improving CO2 selectivity in polymerized room-temperature ionic liquid gas separation membranes through incorporation of polar substituents |
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| Authors: | Jason E. Bara Christopher J. Gabriel Evan S. Hatakeyama Trevor K. Carlisle Sonja Lessmann Richard D. Noble Douglas L. Gin |
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| Affiliation: | 1. Department of Chemical & Biological Engineering, University of Colorado, Boulder, CO 80309-0424, United States;2. Department of Chemistry & Biochemistry, University of Colorado, Boulder, CO 80309-0215, United States |
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| Abstract: | Solid, polymer membranes fabricated from room-temperature ionic liquid monomers containing oligo(ethylene glycol) or nitrile-terminated alkyl substituents tethered to imidazolium cations were found to exhibit ideal CO2/N2 and CO2/CH4 separation factors significantly greater than those with comparable length n-alkyl substituents, with similar CO2 permeability. Polymers containing these functional groups exhibited CO2/N2 gas separation performance exceeding the “upper bound” of a “Robeson Plot”. |
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| Keywords: | CO2 Room-temperature ionic liquid Membrane Polymer Synthesis |
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