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Title: Gas separation mechanism of CO2 selective amidoxime-poly(1-trimethylsilyl-1-propyne) membranes

Journal Article · · Polymer Chemistry
DOI:https://doi.org/10.1039/C7PY00056A· OSTI ID:1361374

Polymeric membranes for CO2 separation have drawn significant attention in academia and industry. We prepared amidoxime-functionalized poly(1-trimethylsilyl-1-propyne) (AO-PTMSP) membranes through hydrosilylation and post-polymerization modification. Compared to neat PTMSP membranes, the AO-PTMSP membranes showed significant enhancements in CO2/N2 gas separation performance (CO2 permeability ~6000 Barrer; CO2/N2 selectivity 17). This systematic study provides clear guidelines on how to tune the CO2-philicity within PTMSP matrices and the effects on gas selectivity. Key parameters for elucidating the gas transport mechanism were discussed based on CO2 sorption measurements and fractional free volume estimates. The effect of the AO content on CO2/N2 selectivity was further examined by means of density functional theory calculations. Here, both experimental and theoretical data provide consistent results that conclusively show that CO2/N2 separation performance is enhanced by increased CO2 polymer interactions.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC); USDOE Office of Fossil Energy (FE)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1361374
Journal Information:
Polymer Chemistry, Vol. 8, Issue 21; ISSN 1759-9954
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

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