Thin-film composite membranes based on hyperbranched poly(ethylene oxide) for CO2/N2 separation
Journal Article
·
· Journal of Membrane Science
- State Univ. of New York at Buffalo, NY (United States); University at Buffalo
- State Univ. of New York at Buffalo, NY (United States)
- Univ. of Colorado, Boulder, CO (United States)
Cross-linked amorphous poly(ethylene oxide) (XLPEO) is one of the leading membrane materials for post-combustion CO2 capture. For example, XLPEO prepared from poly(ethylene glycol) methyl ether acrylate (PEGMEA) exhibited CO2 permeability of 570 Barrer and CO2/N2 selectivity of 41 at 35 °C. However, these XLPEOs cannot be dissolved in coating solutions, making it impossible to be fabricated into thin-film composite (TFC) membranes using state-of-the-art manufacturing processes. In this study, we synthesized high molecular weight yet soluble HPEO via atom transfer radical polymerization (ATRP). These polymers were thoroughly characterized and compared with XLPEO, including thermal transitions, free volumes, and pure-gas sorption and permeation properties. A polymer with the best combination of CO2 permeability (540 Barrer) and CO2/N2 selectivity (43) was fabricated into defect-free TFC membranes with a thickness as thin as 506 ± 44 nm. When challenged with simulated flue gas containing water vapor at 35 °C for over 100 h, the membrane shows stable CO2 permeance of 850 GPU and CO2/N2 selectivity of 37, comparable to the leading commercial membranes for carbon capture.
- Research Organization:
- State Univ. of New York at Buffalo, NY (United States)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE; USDOE Office of Fossil Energy (FE)
- Grant/Contract Number:
- FE0031736
- OSTI ID:
- 1865821
- Alternate ID(s):
- OSTI ID: 1837114
- Journal Information:
- Journal of Membrane Science, Journal Name: Journal of Membrane Science Vol. 644; ISSN 0376-7388
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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