期刊
JOURNAL OF MEMBRANE SCIENCE
卷 545, 期 -, 页码 292-300出版社
ELSEVIER
DOI: 10.1016/j.memsci.2017.09.086
关键词
Ion gel; Cross-linked poly(ethylene oxide); Carbon dioxide permeability; Gas separation membrane; Solid electrolyte
资金
- U.S. Department of Energy's National Energy Technology Laboratory's ongoing research on CO2 capture under the RES [DE-FE0004000]
- Department of Energy, National Energy Technology Laboratory, an agency of the United States Government
- AECOM
- U.S. Department of Energy
- U.S. Department of Energy's Mickey Leland Energy Fellowship Program
Ion gel films were prepared by incorporating eight commercially available ionic liquids in two different crosslinked polymer matrices to evaluate their phase miscibility, gas permeability and ionic conductivity for potential applications as gas separation membranes and solid electrolyte materials. The ionic liquids cations were 1-ethyl3- methylimidazolium, 1-ethyl-3-methylpyridinium, 1-butyl-1-methylpyrrolidinium, tributylmethylphosphonium, and butyltrimethylammonium with a common anion (bis(trifluoromethylsulfonyl) imide). In addition, ionic liquids with 1-ethyl-3-methylimidazolium cation with acetate, dicyanamide and tetrafluoroborate counterions were evaluated. The two polymers were cross-linked poly(ethylene oxide) and cross-linked poly(ethylene oxide)/siloxane copolymer. Differential scanning calorimetry, X-ray diffractometry and visual observations were performed to evaluate the ion gels' miscibility, thermal stability and homogeneity. Ionic liquids with the least basic anion (bis(trifluoromethylsulfonyl) imide) and aromatic cations containing acidic proton (e.g. imidazolium and pyridinium) gave the most stable and miscible ion gels. Phase stability was shown to be a function of both ionic liquid content and temperature, with phase separation observed at elevated temperatures. Gas permeability testing with carbon dioxide and nitrogen and ionic conductivity measurements confirmed that these ionic liquids increased the gas permeability and ionic conductivity of the polymers.
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