期刊
MACROMOLECULES
卷 52, 期 4, 页码 1589-1600出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.8b02497
关键词
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资金
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Chemical Sciences, Geosciences, and Biosciences Division [DE-SC0018179]
- University of Tennessee
- U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES), Chemical Sciences, Geosciences, and Biosciences Division
- U.S. Department of Energy (DOE) [DE-SC0018179] Funding Source: U.S. Department of Energy (DOE)
We demonstrate that the CO2/N-2 gas separation performance of alkoxysilyl-substituted vinyl-added polynorbornenes (VAPNBs) may be significantly enhanced via incorporation of the monomer 5-tris(2-methoxyethoxy)-silyl-2-norbornene. As the molar ratio of this monomer is increased, substantial increases in CO2/N-2 selectivity are realized with minimal decrease in CO2 permeability. This trend ignores the traditional permeability/selectivity trade-off relationship and yields an optimal membrane whose performance reaches the 2008 upper bound for CO2/N-2 separations. Though the inclusion of 5-tris(2-methoxyethoxy)-silyl-2-norbornene units was initially hypothesized to maximize CO2 solubility, detailed gas sorption studies reveal that these highly glassy materials essentially lack any Langmuir sorption component and indicate that their improved CO2/N-2 selectivity is due to decreased N-2 solubility within the matrix. Computational modeling suggests that the source of this apparent N-2-phobicity is likely explained through comparative analyses of polymer-polymer and polymer-gas interactions. Lastly, mixed-gas permeation tests are performed to provide a more realistic look at real-world gas separation performance.
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