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Title: Impact of tuning CO 2-philicity in polydimethylsiloxane-based membranes for carbon dioxide separation

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 CO 2 permeability and CO 2/N 2 selectivity. The overall gas separation performance (CO 2 permeability 6800 Barrer; CO 2/N 2 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 CO 2-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.
 [1] ;  [2] ;  [2] ;  [1] ;  [3] ;  [3] ;  [1] ;  [1] ;  [4] ;  [1] ;  [4] ;  [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
  4. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Journal of Membrane Science
Additional Journal Information:
Journal Volume: 530; Journal ID: ISSN 0376-7388
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Sponsoring Org:
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 Orgs:
Univ. of California, Riverside, CA (United States)
Country of Publication:
United States
54 ENVIRONMENTAL SCIENCES; Membranes; CO2 Separation; CO2-Philic Group; Amidoxime; PDMS
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1414956