The gas separation effects of annealing polyimide-organosilicate hybrid membranes

C. Hibshman; C. J. Cornelius; E. Marand

doi:10.1016/S0376-7388(02)00306-X

The gas separation effects of annealing polyimide-organosilicate hybrid membranes

C. Hibshman, C. J. Cornelius, E. Marand

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

137 Scopus citations

Abstract

Polyimide-organosilicate hybrid membranes were subjected to annealing to enhance gas separation performance. These membranes consisted of organosilicate domains covalently bonded to a 6FDA-6FpDA-DABA polyimide using partially hydrolyzed tetramethoxysilane (TMOS), methyltrimethoxysilane (MTMOS) or phenyltrimethoxysilane (PTMOS). The transport properties of the hybrid membranes were evaluated using pure gases (He, O₂, N₂, CH₄, CO₂) at 35°C and a feed pressure of 4atm. The permeability for most of the membranes increased 200-500% after the annealing process while the permselectivity dropped anywhere from 0 to 50%. The exceptions were the 6FDA-6FpDA-DABA-25 22.5% TMOS and MTMOS hybrid membranes, both of which exhibited increases in the CO₂ permeability and CO₂-CH₄ permselectivity. The transport data was compared to Robeson's 1991 "upper bound" and exceeded the boundary in some cases. The increase in permeation was attributed to changes in the free volume distribution and enhanced local segmental mobility of the chain ends resulting from the removal of sol-gel condensation and polymer degradation byproducts.

Original language	English (US)
Pages (from-to)	25-40
Number of pages	16
Journal	Journal of Membrane Science
Volume	211
Issue number	1
DOIs	https://doi.org/10.1016/S0376-7388(02)00306-X
State	Published - Jan 1 2003
Externally published	Yes

Keywords

Composite membranes
Gas separations
Inorganic membranes
Organosilicate
Polyimide

ASJC Scopus subject areas

Biochemistry
General Materials Science
Physical and Theoretical Chemistry
Filtration and Separation

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10.1016/S0376-7388(02)00306-X

Cite this

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title = "The gas separation effects of annealing polyimide-organosilicate hybrid membranes",

abstract = "Polyimide-organosilicate hybrid membranes were subjected to annealing to enhance gas separation performance. These membranes consisted of organosilicate domains covalently bonded to a 6FDA-6FpDA-DABA polyimide using partially hydrolyzed tetramethoxysilane (TMOS), methyltrimethoxysilane (MTMOS) or phenyltrimethoxysilane (PTMOS). The transport properties of the hybrid membranes were evaluated using pure gases (He, O2, N2, CH4, CO2) at 35°C and a feed pressure of 4atm. The permeability for most of the membranes increased 200-500% after the annealing process while the permselectivity dropped anywhere from 0 to 50%. The exceptions were the 6FDA-6FpDA-DABA-25 22.5% TMOS and MTMOS hybrid membranes, both of which exhibited increases in the CO2 permeability and CO2-CH4 permselectivity. The transport data was compared to Robeson's 1991 {"}upper bound{"} and exceeded the boundary in some cases. The increase in permeation was attributed to changes in the free volume distribution and enhanced local segmental mobility of the chain ends resulting from the removal of sol-gel condensation and polymer degradation byproducts.",

keywords = "Composite membranes, Gas separations, Inorganic membranes, Organosilicate, Polyimide",

author = "C. Hibshman and Cornelius, {C. J.} and E. Marand",

note = "Funding Information: The authors would like to thank the National Science Foundation for sponsoring this project via grant CTS-0107488 and the North American Membrane Society for an undergraduate research fellowship for C. Hibshman. The authors are also deeply indebted to Steve McCartney for his assistance with the TEM images. Many thanks are extended to David Williamson and Koji Yamauchi from the Department of Chemistry at Virginia Technology for assistance with the TGA–MS.",

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AU - Hibshman, C.

AU - Cornelius, C. J.

AU - Marand, E.

N1 - Funding Information: The authors would like to thank the National Science Foundation for sponsoring this project via grant CTS-0107488 and the North American Membrane Society for an undergraduate research fellowship for C. Hibshman. The authors are also deeply indebted to Steve McCartney for his assistance with the TEM images. Many thanks are extended to David Williamson and Koji Yamauchi from the Department of Chemistry at Virginia Technology for assistance with the TGA–MS.

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The gas separation effects of annealing polyimide-organosilicate hybrid membranes

Abstract

Keywords

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