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Open AccessArticle

Synthesis and Performance of Aromatic Polyamide Ionenes as Gas Separation Membranes

1
Department of Chemical & Biological Engineering, University of Alabama, Tuscaloosa, AL 35487-0203, USA
2
NASA Marshall Space Flight Center, Huntsville, AL 35812, USA
*
Author to whom correspondence should be addressed.
Membranes 2020, 10(3), 51; https://doi.org/10.3390/membranes10030051
Received: 27 February 2020 / Revised: 17 March 2020 / Accepted: 20 March 2020 / Published: 22 March 2020
(This article belongs to the Special Issue Ionic Liquid-based Materials for Membrane Processes)
Here, we report the synthesis and thermophysical properties of seven primarily aromatic, imidazolium-based polyamide ionenes. The effects of varied para-, meta-, and ortho-connectivity, and spacing of ionic and amide functional groups, on structural and thermophysical properties were analyzed. Suitable, robust derivatives were cast into thin films, neat, or with stoichiometric equivalents of the ionic liquid (IL) 1-benzy-3-methylimidazolium bistriflimide ([Bnmim][Tf2N]), and the gas transport properties of these membranes were measured. Pure gas permeabilities and permselectivities for N2, CH4, and CO2 are reported. Consistent para-connectivity in the backbone was shown to yield the highest CO2 permeability and suitability for casting as a very thin, flexible film. Derivatives containing terephthalamide segments exhibited the highest CO2/CH4 and CO2/N2 selectivities, yet CO2 permeability decreased with further deviation from consistent para-linkages. View Full-Text
Keywords: aromatic polyamides; ionic liquids; ionenes; membranes; gas separations aromatic polyamides; ionic liquids; ionenes; membranes; gas separations
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MDPI and ACS Style

O’Harra, K.E.; Kammakakam, I.; Noll, D.M.; Turflinger, E.M.; Dennis, G.P.; Jackson, E.M.; Bara, J.E. Synthesis and Performance of Aromatic Polyamide Ionenes as Gas Separation Membranes. Membranes 2020, 10, 51.

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