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Title: Ionic liquid compatibility in polyethylene oxide/siloxane ion gel membranes

Abstract

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.

Authors:
 [1];  [1];  [2];  [2];  [2];  [2];  [2]
+ Show Author Affiliations
  1. National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States); AECOM Corporation, Pittsburgh, PA (United States)
  2. National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)
Publication Date:
Research Org.:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1455428
Alternate Identifier(s):
OSTI ID: 1495734
Report Number(s):
CONTR-PUB-398
Journal ID: ISSN 0376-7388; PII: S0376738817316873
Grant/Contract Number:  
FE0004000
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Membrane Science
Additional Journal Information:
Journal Volume: 545; Journal Issue: C; Journal ID: ISSN 0376-7388
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Ion gel; Cross-linked poly(ethylene oxide); Carbon dioxide permeability; Gas separation membrane; Solid electrolyte

Citation Formats

Kusuma, Victor A., Macala, Megan K., Liu, Jian, Marti, Anne M., Hirsch, Rebecca J., Hill, Lawrence J., and Hopkinson, David. Ionic liquid compatibility in polyethylene oxide/siloxane ion gel membranes. United States: N. p., 2018. Web. doi:10.1016/j.memsci.2017.09.086.
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Kusuma, Victor A., Macala, Megan K., Liu, Jian, Marti, Anne M., Hirsch, Rebecca J., Hill, Lawrence J., & Hopkinson, David. Ionic liquid compatibility in polyethylene oxide/siloxane ion gel membranes. United States. https://doi.org/10.1016/j.memsci.2017.09.086
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Kusuma, Victor A., Macala, Megan K., Liu, Jian, Marti, Anne M., Hirsch, Rebecca J., Hill, Lawrence J., and Hopkinson, David. Tue . "Ionic liquid compatibility in polyethylene oxide/siloxane ion gel membranes". United States. https://doi.org/10.1016/j.memsci.2017.09.086. https://www.osti.gov/servlets/purl/1455428.
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@article{osti_1455428,
title = {Ionic liquid compatibility in polyethylene oxide/siloxane ion gel membranes},
author = {Kusuma, Victor A. and Macala, Megan K. and Liu, Jian and Marti, Anne M. and Hirsch, Rebecca J. and Hill, Lawrence J. and Hopkinson, David},
abstractNote = {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.},
doi = {10.1016/j.memsci.2017.09.086},
journal = {Journal of Membrane Science},
number = C,
volume = 545,
place = {United States},
year = {Tue Oct 02 00:00:00 EDT 2018},
month = {Tue Oct 02 00:00:00 EDT 2018}
}
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https://doi.org/10.1016/j.memsci.2017.09.086
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