The effect of Poly(Ethylene oxide) cross-linking structure on the mechanical properties and CO2 separation performance of an ion gel membrane

Kusuma, Victor A.; Chen, Christina; Baker, James S.; Macala, Megan K.; Hopkinson, David

doi:10.1016/j.polymer.2019.121666

The effect of Poly(Ethylene oxide) cross-linking structure on the mechanical properties and CO₂ separation performance of an ion gel membrane

Journal Article · Sun Jul 21 00:00:00 EDT 2019 · Polymer

DOI:https://doi.org/10.1016/j.polymer.2019.121666· OSTI ID:1607770

^[1]; Chen, Christina ^[2]; Baker, James S. ^[3]; Macala, Megan K. ^[1]; Hopkinson, David ^[3]

National Energy Technology Lab. (NETL), Pittsburgh, PA (United States); Leidos Research Support Team, Pittsburgh, PA (United States)
Yale Univ., New Haven, CT (United States)
National Energy Technology Lab. (NETL), Pittsburgh, PA (United States)

Ionic liquid gels of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide plasticizing a cross-linked poly(ethylene oxide) are high performance CO₂ separation membranes. Here, the effect of polymer cross-link density on the ionic liquid stability, on the mechanical properties of the resulting films, and on the gas separation properties were studied. Cross-link density was modified by changing the chain length of ethoxylated diacrylate and triacrylate monomers, and by incorporating small amounts of short, multifunctional acrylate monomers. Without the ionic liquid acting as permanent plasticizer, higher cross-link density is associated with higher yield strength but lower strain at break, as expected. In a plasticized network, however, the loss in flexibility is not accompanied by higher yield strength, leaving ion gels made from highly cross-linked network more fragile than those having longer, more flexible chains. In conclusion, lowering cross-link density also allowed more ionic liquids to be incorporated as a phase stable gel and led to better CO₂ separation performance.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Fossil Energy (FE)

Grant/Contract Number:: 89243318CFE000003

OSTI ID:: 1607770

Alternate ID(s):: OSTI ID: 1545641

Journal Information:: Polymer, Journal Name: Polymer Journal Issue: C Vol. 180; ISSN 0032-3861

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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