UNSPECIFIED. (2003) Structural characterisation of organosiloxane membranes. BRITISH CERAMIC TRANSACTIONS, 102 (3). pp. 93-98. ISSN 0967-9782

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Abstract

A sol gel polymerisation/pyrolysis route has been used to produce hybrid organic-inorganic membranes. This route involved the copolymerisation of two organo-functional precursors, methyltrimethoxysilane and phenyltrimethoxysilane or diphenyldimethoxysilane. The thermal stability and structural evolution with temperature of the resulting xerogels were investigated using multinuclear solid state NMR (C-13 and Si-29), thermal analysis (TGA and DTA), and FTIR. It is shown that during pyrolysis the methyl ligand is replaced with hydroxyl groups, some of which condense into siloxane linkages. The retained hydroxyl groups are thought to provide adsorption sites throughout the material onto which polar gas molecules (such as CO2) can adsorb, and diffuse under a pressure gradient. This hypothesis is supported by the results of gas permeation trials on the membranes, and thus a direct link is established between membrane performance and material structure.

Item Type:	Journal Article
Subjects:	T Technology > TP Chemical technology
Journal or Publication Title:	BRITISH CERAMIC TRANSACTIONS
Publisher:	MANEY PUBLISHING
ISSN:	0967-9782
Date:	June 2003
Volume:	102
Number:	3
Number of Pages:	6
Page Range:	pp. 93-98
Identification Number:	10.1179/096797803225004918
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/9554

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