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29Si, 17O Liquid NMR and 29Si CP-MAS NMRCharacterization of Siloxane-Oxide Materials, [(CH3)2SiO/TiO2, (CH3)2SiO/ZrO2]

Published online by Cambridge University Press:  21 February 2011

Florence Babonneau
Florence Babonneau*
Affiliation:
Chimie de la Matière Condensée, Université Pierre et Marie Curie / CNRS, 4 place Jussieu, Paris, France.
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Abstract

Sol-gel derived siloxane oxide materials are an entirely new family ofhybrid systems at the frontier between silicones and glasses or ceramics,with a large variety of potential applications. Better control of thechemistry involved in their preparation should lead to an improvement intheir properties, and this requires an investigation of the whole process,from the solution to the final materials. Nuclear Magnetic Resonance is avery suitable technique for this purpose, and this paper will give someillustrations on model systems (CH3)2SiO/TiO2, (CH3)2SiO/ZrO2, prepared fromdimethyldiethoxysilane and titanium or zirconium alkoxides. It will befocused mainly on the use of 170 solution NMR which clearly showsthe formation of Si-O-Ti or Si-O-Zr bonds, but also their disappearanceduring the aging process. 29Si MAS-NMR spectra of dried gelsconfirm that the difunctional units are mainly in polydimethylsiloxanechains, and that the system is phase separated. However, the use ofcross-polarization techniques involving lK and 29Sinuclei will allow the detection of small number of units in a moreconstrained environment, certainly close to oxide-based particles.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 346: Symposium N – Better Ceramics Through Chemistry VI , 1994 , 949
Copyright
Copyright © Materials Research Society 1998

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