Free-standing, polysilsesquioxane-based inorganic/organic hybrid membranes for gas separations

Woo Ram Kang; Albert S. Lee; Sunghwan Park; Sang Hee Park; Kyung Youl Baek; Ki Bong Lee; Sang-Hyup Lee; Jung-hyun Lee; Seung Sang Hwang; Jong Suk Lee

doi:10.1016/j.memsci.2014.10.024

Free-standing, polysilsesquioxane-based inorganic/organic hybrid membranes for gas separations

Woo Ram Kang, Albert S. Lee, Sunghwan Park, Sang Hee Park, Kyung Youl Baek, Ki Bong Lee, Sang-Hyup Lee, Jung-hyun Lee, Seung Sang Hwang, Jong Suk Lee

Research output: Contribution to journal › Article

20 Citations (Scopus)

Abstract

Polysilsesquioxanes (PSSQs) are composite materials consisting of inorganic framework and organic functional groups. Their inherent dual characteristics offer various applications including microelectronics, optics and biosciences. For the first time, free standing ladder-like PSSQ films were successfully prepared for gas separations, allowing practical applications in the membrane area. In order to fabricate a free-standing PSSQ film, a novel ladder-like poly(phenyl-co-glycidoxypropyl) silsesquioxanes with phenyl:glycidoxypropyl copolymer ratio of 6:4 (LPG64) were synthesized by a base-catalyzed sol-gel reaction. Moreover, the LPG64 films were thermally crosslinked with octa(aminophenyl)-T8-silsesquioxane (OAPS) with different concentrations of OAPS. Single gas (i.e. He, H₂, CO₂, O₂, N₂, and CH₄) transport measurements were performed for the LPG64 as well as LPG64/OAPS composite membranes. The LPG64 membrane exhibited a relatively high CO₂ permeability of 47.88Barrer compared to other gases with CO₂/N₂ permselectivity of 30.5. The annealing effect on the transport results of the LPG64 membrane was negligible due to its rigid inorganic framework. Combination of our transport analysis and XRD characterization demonstrated that the addition of OAPS led to more dense chain packing, reducing permeability for all the gases tested in this work with increase in permselectivities. Especially, the LPG64/OAPS (80/20wt/wt) membrane improved He/N₂ and H₂/N₂ permselectivities by 98% and 80%, respectively, compared to those for neat LPG64 membranes.

Original language	English
Pages (from-to)	384-394
Number of pages	11
Journal	Journal of Membrane Science
Volume	475
DOIs	https://doi.org/10.1016/j.memsci.2014.10.024
Publication status	Published - 2015 Feb 1

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Keywords

Crosslinking
Free-standing composite membranes
Gas separations
Ladder-like polysilsesquioxane

ASJC Scopus subject areas

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

Cite this

Kang, W. R., Lee, A. S., Park, S., Park, S. H., Baek, K. Y., Lee, K. B., Lee, S-H., Lee, J., Hwang, S. S., & Lee, J. S. (2015). Free-standing, polysilsesquioxane-based inorganic/organic hybrid membranes for gas separations. Journal of Membrane Science, 475, 384-394. https://doi.org/10.1016/j.memsci.2014.10.024

Free-standing, polysilsesquioxane-based inorganic/organic hybrid membranes for gas separations. / Kang, Woo Ram; Lee, Albert S.; Park, Sunghwan; Park, Sang Hee; Baek, Kyung Youl; Lee, Ki Bong; Lee, Sang-Hyup; Lee, Jung-hyun; Hwang, Seung Sang; Lee, Jong Suk.

In: Journal of Membrane Science, Vol. 475, 01.02.2015, p. 384-394.

Research output: Contribution to journal › Article

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abstract = "Polysilsesquioxanes (PSSQs) are composite materials consisting of inorganic framework and organic functional groups. Their inherent dual characteristics offer various applications including microelectronics, optics and biosciences. For the first time, free standing ladder-like PSSQ films were successfully prepared for gas separations, allowing practical applications in the membrane area. In order to fabricate a free-standing PSSQ film, a novel ladder-like poly(phenyl-co-glycidoxypropyl) silsesquioxanes with phenyl:glycidoxypropyl copolymer ratio of 6:4 (LPG64) were synthesized by a base-catalyzed sol-gel reaction. Moreover, the LPG64 films were thermally crosslinked with octa(aminophenyl)-T8-silsesquioxane (OAPS) with different concentrations of OAPS. Single gas (i.e. He, H2, CO2, O2, N2, and CH4) transport measurements were performed for the LPG64 as well as LPG64/OAPS composite membranes. The LPG64 membrane exhibited a relatively high CO2 permeability of 47.88Barrer compared to other gases with CO2/N2 permselectivity of 30.5. The annealing effect on the transport results of the LPG64 membrane was negligible due to its rigid inorganic framework. Combination of our transport analysis and XRD characterization demonstrated that the addition of OAPS led to more dense chain packing, reducing permeability for all the gases tested in this work with increase in permselectivities. Especially, the LPG64/OAPS (80/20wt/wt) membrane improved He/N2 and H2/N2 permselectivities by 98% and 80%, respectively, compared to those for neat LPG64 membranes.",

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AU - Baek, Kyung Youl

AU - Lee, Ki Bong

AU - Lee, Sang-Hyup

AU - Lee, Jung-hyun

AU - Hwang, Seung Sang

AU - Lee, Jong Suk

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AB - Polysilsesquioxanes (PSSQs) are composite materials consisting of inorganic framework and organic functional groups. Their inherent dual characteristics offer various applications including microelectronics, optics and biosciences. For the first time, free standing ladder-like PSSQ films were successfully prepared for gas separations, allowing practical applications in the membrane area. In order to fabricate a free-standing PSSQ film, a novel ladder-like poly(phenyl-co-glycidoxypropyl) silsesquioxanes with phenyl:glycidoxypropyl copolymer ratio of 6:4 (LPG64) were synthesized by a base-catalyzed sol-gel reaction. Moreover, the LPG64 films were thermally crosslinked with octa(aminophenyl)-T8-silsesquioxane (OAPS) with different concentrations of OAPS. Single gas (i.e. He, H2, CO2, O2, N2, and CH4) transport measurements were performed for the LPG64 as well as LPG64/OAPS composite membranes. The LPG64 membrane exhibited a relatively high CO2 permeability of 47.88Barrer compared to other gases with CO2/N2 permselectivity of 30.5. The annealing effect on the transport results of the LPG64 membrane was negligible due to its rigid inorganic framework. Combination of our transport analysis and XRD characterization demonstrated that the addition of OAPS led to more dense chain packing, reducing permeability for all the gases tested in this work with increase in permselectivities. Especially, the LPG64/OAPS (80/20wt/wt) membrane improved He/N2 and H2/N2 permselectivities by 98% and 80%, respectively, compared to those for neat LPG64 membranes.

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10.1016/j.memsci.2014.10.024