Structural characterisation of organosiloxane membranes
UNSPECIFIED. (2003) Structural characterisation of organosiloxane membranes. BRITISH CERAMIC TRANSACTIONS, 102 (3). pp. 93-98. ISSN 0967-9782Full text not available from this repository.
Official URL: http://dx.doi.org/10.1179/096797803225004918
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|
|Number of Pages:||6|
|Page Range:||pp. 93-98|
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