Abstract
The modification of highly permeable films of brominated 1,2-disubstituted polyacetylene, poly(4-methyl-2-penthyne), via incorporation of in situ formed butylimidazolium bromide is reported for the first time. Principal possibility and efficiency of supercritical CO2 and CHF3 use as reaction media for the corresponding process, namely for quaternization of butylimidazole by brominated polymer are revealed. As a result, we prepared new membrane materials possessing promising properties such as stability toward organic solvents, good mechanical properties and significantly improved CO2-selectivity while maintaining gas permeability at high values. Comparative analysis of the results allowed us to determine content and conditions for the incorporation of butylimidazolium groups optimal for most efficient separation of CO2 from industrial gas mixtures. These results are of interest for the designing of new CO2 selective membranes.
Highlights
The problem of CO2 separation from industrial gas streams of various compositions is among most prominent ecological challenges due to well-known greenhouse effect of carbon dioxide provoking considerable climate changes
The reactor vessel
For the preparation of butylimidazole-containing derivatives of PMP, PMP-Br films were treated by BMIm in supercritical fluids (SCF) CO2 or CHF3 medium at various temperatures
Summary
The problem of CO2 separation from industrial gas streams of various compositions is among most prominent ecological challenges due to well-known greenhouse effect of carbon dioxide provoking considerable climate changes. One of the known methods to improve gas transport properties of polymers is the incorporation of polar substituents as a side group of macromolecular chain Upon such a modification, the increase in CO2 /gas X selectivity may originate from higher affinity of polar functional groups toward CO2 , which, in turn, leads to the increase in the CO2 solubility coefficient of the membrane material [6]. A polymer belonging to the group of 1,2-disubstituted polyacetylenes, namely poly(4-methyl-2-pentyne) (PMP) was studied for surface modification This polymer exhibits high permeability toward permanent and condensable gases as well as high selectivity in separating n-C4 H10 from its mixtures with e.g., CH4 [12,13].
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