Effect of Cross-Link Density on Carbon Dioxide Separation in Polydimethylsiloxane-Norbornene Membranes.
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 (CO2 permeability≈6800 Barrer; CO2 /N2 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.
Department of Chemistry, University of Tennessee, Knoxville, TN, 37996, USA.
Tao
T
Hong
Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.
Zhenbin
Z
Niu
Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.
Xunxiang
X
Hu
Department of Chemistry, University of Tennessee, Knoxville, TN, 37996, USA.
Kevin
K
Gmernicki
Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.
Shiwang
S
Cheng
Department of Chemistry, University of Tennessee, Knoxville, TN, 37996, USA.
Fei
F
Fan
Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.
J Casey
JC
Johnson
Department of Chemistry, University of Tennessee, Knoxville, TN, 37996, USA.
Eunice
E
Hong
Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.
Shannon
S
Mahurin
Department of Chemistry, University of California, Riverside, CA, 92521, USA.
De-en
DE
Jiang
Department of Chemistry, University of Tennessee, Knoxville, TN, 37996, USA.
Brian
B
Long
Department of Chemistry, University of Tennessee, Knoxville, TN, 37996, USA.|Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.
Jimmy
J
Mays
Department of Chemistry, University of Tennessee, Knoxville, TN, 37996, USA.|Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.
Alexei
A
Sokolov
Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.
Tomonori
T
Saito
D002245:Carbon Dioxide / Q000302:isolation & purification*; D003432:Cross-Linking Reagents / Q000737:chemistry*; D004129:Dimethylpolysiloxanes / Q000737:chemistry*; D008567:Membranes, Artificial; D015394:Molecular Structure; D009636:Norbornanes / Q000737:chemistry*; D010539:Permeability; D013499:Surface Properties
D003432:Cross-Linking Reagents; D004129:Dimethylpolysiloxanes; D008567:Membranes, Artificial; D009636:Norbornanes; D002245:Carbon Dioxide; C013830:baysilon
carbon dioxide; membranes; permeability; polymers; ring-opening metathesis polymerization