Impact of tuning CO2-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...

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Bibliographic Details
Published in:Journal of membrane science 2017-05, Vol.530, p.213-219
Main Authors: Hong, Tao, Chatterjee, Sabornie, Mahurin, Shannon M., Fan, Fei, Tian, Ziqi, Jiang, De-en, Long, Brian K., Mays, Jimmy W., Sokolov, Alexei P., Saito, Tomonori
Format: Article
Language:English
Subjects:
Amidoxime
CO2 Separation
CO2-Philic Group
ENVIRONMENTAL SCIENCES
Membranes
PDMS
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Summary: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.
ISSN:0376-7388
1873-3123
DOI:10.1016/j.memsci.2017.02.033