Ionic liquid compatibility in polyethylene oxide/siloxane ion gel membranes

Kusuma, Victor A.; Macala, Megan K.; Liu, Jian; Marti, Anne M.; Hirsch, Rebecca J.; Hill, Lawrence J.; Hopkinson, David

doi:10.1016/j.memsci.2017.09.086

Ionic liquid compatibility in polyethylene oxide/siloxane ion gel membranes

Journal Article · Tue Oct 02 00:00:00 EDT 2018 · Journal of Membrane Science

DOI:https://doi.org/10.1016/j.memsci.2017.09.086· OSTI ID:1455428

Kusuma, Victor A. ^[1]; Macala, Megan K. ^[1]; Liu, Jian ^[2]; Marti, Anne M. ^[2]; Hirsch, Rebecca J. ^[2]; Hill, Lawrence J. ^[2]; Hopkinson, David ^[2]

National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States); AECOM Corporation, Pittsburgh, PA (United States)
National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)

Ion gel films were prepared by incorporating eight commercially available ionic liquids in two different cross-linked 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-ethyl-3-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. In conclusion, 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.

View Accepted Manuscript (DOE)

Research Organization:: National Energy Technology Laboratory (NETL), Pittsburgh, PA, and Morgantown, WV (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FE0004000

OSTI ID:: 1455428

Alternate ID(s):: OSTI ID: 1495734

Report Number(s):: CONTR-PUB--398; PII: S0376738817316873

Journal Information:: Journal of Membrane Science, Journal Name: Journal of Membrane Science Journal Issue: C Vol. 545; ISSN 0376-7388

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Carbon dioxide permeability
Cross-linked poly(ethylene oxide)
Gas separation membrane
Ion gel
Solid electrolyte

Ionic liquid compatibility in polyethylene oxide/siloxane ion gel membranes

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