Cross-Linked Poly(ethylene oxide) Ion Gels Containing Functionalized Imidazolium Ionic Liquids as Carbon Dioxide Separation Membranes

doi:https://doi.org/10.1021/acs.iecr.8b02739

Title: Cross-Linked Poly(ethylene oxide) Ion Gels Containing Functionalized Imidazolium Ionic Liquids as Carbon Dioxide Separation Membranes

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Abstract

1,3-Substituted imidazolium bis(trifluoromethylsulfonyl)imide (Tf ₂N) ionic liquids (ILs) were incorporated at 40 and 60 vol % loading into a cross-linked poly(ethylene oxide) polymer network to create ion gels for carbon dioxide (CO ₂)-selective gas separation membranes. The ILs plasticize the poly(ethylene oxide)-based polymer to increase its gas permeability. Compared to the base polymer, with a CO ₂ permeability of 145 barrer and a CO ₂ against nitrogen (N ₂) selectivity of 47, the highest CO ₂ permeability achieved was 530 barrer coupled with a CO ₂/N ₂ selectivity of 31 by having 60 vol % [1-ethyl-3-methylimidazolium][Tf ₂N]. The extent of gas permeability improvement depends on the cation’s terminal substituent. Substituents that promote additional noncovalent intermolecular interactions, such as hydroxyl, benzyl, and nitrile, can reduce the gas diffusivity by reducing the polymer chain mobility. Here, while n-alkyl, branched alkyl, and oligo(ethylene glycol) substituents can significantly increase the gas permeability, the shortest substituents (such as ethyl) were the most effective because they promote high ionic charge density.

Authors:

^[1]; Macala, Megan K. ^[1]; Baker, James S. ^[2]; Hopkinson, David ^[2]

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

Publication Date:: 2018-08-05

Research Org.:: National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)

Sponsoring Org.:: USDOE Office of Fossil Energy (FE)

OSTI Identifier:: 1482986

Grant/Contract Number:: FE0004000

Resource Type:: Journal Article: Accepted Manuscript

Journal Name:: Industrial and Engineering Chemistry Research

Additional Journal Information:: Journal Volume: 57; Journal Issue: 34; Journal ID: ISSN 0888-5885

Publisher:: American Chemical Society (ACS)

Country of Publication:: United States

Language:: English

Subject:: 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats


                    Kusuma, Victor A., Macala, Megan K., Baker, James S., and Hopkinson, David. Cross-Linked Poly(ethylene oxide) Ion Gels Containing Functionalized Imidazolium Ionic Liquids as Carbon Dioxide Separation Membranes.  United States: N. p., 2018. 
        Web.  doi:10.1021/acs.iecr.8b02739.

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                    Kusuma, Victor A., Macala, Megan K., Baker, James S., & Hopkinson, David. Cross-Linked Poly(ethylene oxide) Ion Gels Containing Functionalized Imidazolium Ionic Liquids as Carbon Dioxide Separation Membranes.  United States.  https://doi.org/10.1021/acs.iecr.8b02739

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                    Kusuma, Victor A., Macala, Megan K., Baker, James S., and Hopkinson, David. Sun .  
        "Cross-Linked Poly(ethylene oxide) Ion Gels Containing Functionalized Imidazolium Ionic Liquids as Carbon Dioxide Separation Membranes".  United States.  https://doi.org/10.1021/acs.iecr.8b02739.  https://www.osti.gov/servlets/purl/1482986.

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@article{osti_1482986,

  title        = {Cross-Linked Poly(ethylene oxide) Ion Gels Containing Functionalized Imidazolium Ionic Liquids as Carbon Dioxide Separation Membranes},

  author       = {Kusuma, Victor A. and Macala, Megan K. and Baker, James S. and Hopkinson, David},

  abstractNote = {1,3-Substituted imidazolium bis(trifluoromethylsulfonyl)imide (Tf2N) ionic liquids (ILs) were incorporated at 40 and 60 vol % loading into a cross-linked poly(ethylene oxide) polymer network to create ion gels for carbon dioxide (CO2)-selective gas separation membranes. The ILs plasticize the poly(ethylene oxide)-based polymer to increase its gas permeability. Compared to the base polymer, with a CO2 permeability of 145 barrer and a CO2 against nitrogen (N2) selectivity of 47, the highest CO2 permeability achieved was 530 barrer coupled with a CO2/N2 selectivity of 31 by having 60 vol % [1-ethyl-3-methylimidazolium][Tf2N]. The extent of gas permeability improvement depends on the cation’s terminal substituent. Substituents that promote additional noncovalent intermolecular interactions, such as hydroxyl, benzyl, and nitrile, can reduce the gas diffusivity by reducing the polymer chain mobility. Here, while n-alkyl, branched alkyl, and oligo(ethylene glycol) substituents can significantly increase the gas permeability, the shortest substituents (such as ethyl) were the most effective because they promote high ionic charge density.},

  doi          = {10.1021/acs.iecr.8b02739},

  url          = {https://www.osti.gov/biblio/1482986},
  journal      = {Industrial and Engineering Chemistry Research},

  issn         = {0888-5885},

  number       = 34,

  volume       = 57,

  place        = {United States},

  year         = {2018},

  month        = {8}

}

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