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Title: Impact of tuning CO2-philicity in polydimethylsiloxane-based membranes for carbon dioxide separation

Journal Article · · Journal of Membrane Science
 [1];  [2];  [2];  [1];  [3];  [3];  [1];  [1];  [1];  [2]
  1. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Chemistry
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division
  3. Univ. of California, Riverside, CA (United States). Dept. of Chemistry

Amidoxime-functionalized polydimethylsiloxane (AO-PDMSPNB) membranes with various amidoxime compositions were synthesized via ring-opening metathesis polymerization followed by post-polymerization modification. Compared to other previously reported PDMS-based membranes, the amidoxime-functionalized membranes show enhanced CO2 permeability and CO2/N2 selectivity. The overall gas separation performance (CO2 permeability 6800 Barrer; CO2/N2 selectivity 19) of the highest performing membrane exceeds the Robeson upper bound line, and the excellent permeability of the copolymer itself provides great potential for real world applications where huge volumes of gases are separated. This study details how tuning the CO2-philicity within rubbery polymer matrices influences gas transport properties. Key parameters for tuning gas transport properties are discussed, and the experimental results show good consistency with theoretical calculations. Finally, this study provides a roadmap to enhancing gas separation performance in rubbery polymers by tuning gas solubility selectivity.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Sponsoring Organization:
USDOE; USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Fossil Energy (FE); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Univ. of Tennessee (United States). Joint Directed Research and Development (JDRD) Program
Contributing Organization:
Univ. of California, Riverside, CA (United States)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1347341
Journal Information:
Journal of Membrane Science, Journal Name: Journal of Membrane Science Vol. 530; ISSN 0376-7388
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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