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Effect of Cross‐Link Density on Carbon Dioxide Separation in Polydimethylsiloxane‐Norbornene Membranes
Author(s) -
Hong Tao,
Niu Zhenbin,
Hu Xunxiang,
Gmernicki Kevin,
Cheng Shiwang,
Fan Fei,
Johnson J. Casey,
Hong Eunice,
Mahurin Shan,
Jiang Deen,
Long Brian,
Mays Jimmy,
Sokolov Alexei,
Saito Tomonori
Publication year - 2015
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201500903
Subject(s) - polydimethylsiloxane , membrane , norbornene , polymer , materials science , barrer , chemical engineering , selectivity , gas separation , cross link , polymerization , solubility , polymer chemistry , chemistry , organic chemistry , nanotechnology , composite material , catalysis , biochemistry , engineering
The development of high‐performance materials for carbon dioxide separation and capture will significantly contribute to a solution for climate change. Herein, (bicycloheptenyl)ethyl‐terminated polydimethylsiloxane (PDMSPNB) membranes with varied cross‐link densities were synthesized via ring‐opening metathesis polymerization. The developed polymer membranes show higher permeability and better selectivity than those of conventional cross‐linked PDMS membrane. The achieved performance (CO 2 permeability≈6800 Barrer; CO 2 /N 2 selectivity≈14) is very promising for practical applications. The key to achieving this high performance is the use of an in situ cross‐linking method for difunctional PDMS macromonomers, which provides lightly cross‐linked membranes. By combining positron annihilation lifetime spectroscopy, broadband dielectric spectroscopy, and gas solubility measurements, key parameters necessary for achieving excellent performance have been elucidated.