Side-chain engineering of ladder-structured polysilsesquioxane membranes for gas separations

Sunghwan Park; Albert S. Lee; Yu Seong Do; Jeong F. Kim; Seung Sang Hwang; Young Moo Lee; Jung Hyun Lee; Jong Suk Lee

doi:10.1016/j.memsci.2016.06.016

Side-chain engineering of ladder-structured polysilsesquioxane membranes for gas separations

Sunghwan Park, Albert S. Lee, Yu Seong Do, Jeong F. Kim, Seung Sang Hwang, Young Moo Lee, Jung Hyun Lee, Jong Suk Lee

Department of Chemical and Biological Engineering

Research output: Contribution to journal › Article › peer-review

38 Citations (Scopus)

Abstract

A comprehensive and fundamental gas transport study of ladder-structured polysilsesquioxanes (LPSQs) was systematically performed by investigating the effects of various alkyl substituents, different copolymer ratios, and UV-irradiation induced photo-crosslinking on gas separations. Overall, LPSQ membranes are more suitable for CO₂/N₂ and CO₂/H₂ separations due to a relatively high affinity towards CO₂ as well as rubbery polymer properties. The gas transport in LPSQ membranes was well interpreted by two important parameters, the inter-chain distance and the side chain mobility. A combination of larger inter-chain distance and higher side chain rigidity tends to increase the fractional free volume, resulting in higher gas permeability. Also, it was successfully demonstrated that the separation performance of LPSQ membranes can be predicted by using a logarithmic permeability relationship based on the transport characterization for a series of ladder-structured poly(phenyl-co-methacryloxypropyl)silsesquioxanes. Lastly, the UV-curing process reduced the permeability of LPSQ membranes, increasing the selectivity due to the restricted chain mobility.

Original language	English
Pages (from-to)	202-214
Number of pages	13
Journal	Journal of Membrane Science
Volume	516
DOIs	https://doi.org/10.1016/j.memsci.2016.06.016
Publication status	Published - 2016 Oct 15

Keywords

Gas separations
Ladder-structured polysilsesquioxanes
Membranes
Substituent effects

ASJC Scopus subject areas

Biochemistry
Materials Science(all)
Physical and Theoretical Chemistry
Filtration and Separation

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10.1016/j.memsci.2016.06.016

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title = "Side-chain engineering of ladder-structured polysilsesquioxane membranes for gas separations",

abstract = "A comprehensive and fundamental gas transport study of ladder-structured polysilsesquioxanes (LPSQs) was systematically performed by investigating the effects of various alkyl substituents, different copolymer ratios, and UV-irradiation induced photo-crosslinking on gas separations. Overall, LPSQ membranes are more suitable for CO2/N2 and CO2/H2 separations due to a relatively high affinity towards CO2 as well as rubbery polymer properties. The gas transport in LPSQ membranes was well interpreted by two important parameters, the inter-chain distance and the side chain mobility. A combination of larger inter-chain distance and higher side chain rigidity tends to increase the fractional free volume, resulting in higher gas permeability. Also, it was successfully demonstrated that the separation performance of LPSQ membranes can be predicted by using a logarithmic permeability relationship based on the transport characterization for a series of ladder-structured poly(phenyl-co-methacryloxypropyl)silsesquioxanes. Lastly, the UV-curing process reduced the permeability of LPSQ membranes, increasing the selectivity due to the restricted chain mobility.",

keywords = "Gas separations, Ladder-structured polysilsesquioxanes, Membranes, Substituent effects",

author = "Sunghwan Park and Lee, {Albert S.} and Do, {Yu Seong} and Kim, {Jeong F.} and Hwang, {Seung Sang} and Lee, {Young Moo} and Lee, {Jung Hyun} and Lee, {Jong Suk}",

note = "Funding Information: This research was supported by the Korea CCS R&D Center (KCRC) (No. 2014M1A8A1049315 ), Korea Institute of Energy Technology Evaluation and Planning (KETEP) (No. 20135010100750 ). Partial funding was provided by the Materials Architecturing Research Center of Korea Institute of Science and Technology . Publisher Copyright: {\textcopyright} 2016 Elsevier B.V.",

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doi = "10.1016/j.memsci.2016.06.016",

language = "English",

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T1 - Side-chain engineering of ladder-structured polysilsesquioxane membranes for gas separations

AU - Park, Sunghwan

AU - Lee, Albert S.

AU - Do, Yu Seong

AU - Kim, Jeong F.

AU - Hwang, Seung Sang

AU - Lee, Young Moo

AU - Lee, Jung Hyun

AU - Lee, Jong Suk

N1 - Funding Information: This research was supported by the Korea CCS R&D Center (KCRC) (No. 2014M1A8A1049315 ), Korea Institute of Energy Technology Evaluation and Planning (KETEP) (No. 20135010100750 ). Partial funding was provided by the Materials Architecturing Research Center of Korea Institute of Science and Technology . Publisher Copyright: © 2016 Elsevier B.V.

PY - 2016/10/15

Y1 - 2016/10/15

N2 - A comprehensive and fundamental gas transport study of ladder-structured polysilsesquioxanes (LPSQs) was systematically performed by investigating the effects of various alkyl substituents, different copolymer ratios, and UV-irradiation induced photo-crosslinking on gas separations. Overall, LPSQ membranes are more suitable for CO2/N2 and CO2/H2 separations due to a relatively high affinity towards CO2 as well as rubbery polymer properties. The gas transport in LPSQ membranes was well interpreted by two important parameters, the inter-chain distance and the side chain mobility. A combination of larger inter-chain distance and higher side chain rigidity tends to increase the fractional free volume, resulting in higher gas permeability. Also, it was successfully demonstrated that the separation performance of LPSQ membranes can be predicted by using a logarithmic permeability relationship based on the transport characterization for a series of ladder-structured poly(phenyl-co-methacryloxypropyl)silsesquioxanes. Lastly, the UV-curing process reduced the permeability of LPSQ membranes, increasing the selectivity due to the restricted chain mobility.

AB - A comprehensive and fundamental gas transport study of ladder-structured polysilsesquioxanes (LPSQs) was systematically performed by investigating the effects of various alkyl substituents, different copolymer ratios, and UV-irradiation induced photo-crosslinking on gas separations. Overall, LPSQ membranes are more suitable for CO2/N2 and CO2/H2 separations due to a relatively high affinity towards CO2 as well as rubbery polymer properties. The gas transport in LPSQ membranes was well interpreted by two important parameters, the inter-chain distance and the side chain mobility. A combination of larger inter-chain distance and higher side chain rigidity tends to increase the fractional free volume, resulting in higher gas permeability. Also, it was successfully demonstrated that the separation performance of LPSQ membranes can be predicted by using a logarithmic permeability relationship based on the transport characterization for a series of ladder-structured poly(phenyl-co-methacryloxypropyl)silsesquioxanes. Lastly, the UV-curing process reduced the permeability of LPSQ membranes, increasing the selectivity due to the restricted chain mobility.

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KW - Ladder-structured polysilsesquioxanes

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Side-chain engineering of ladder-structured polysilsesquioxane membranes for gas separations

Abstract

Keywords

ASJC Scopus subject areas

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