{sup 29}Si, {sup 17}O liquid NMR and {sup 29}Si CP-MAS NMR characterization of siloxane-oxide materials, [(CH{sub 3}){sub 2}SiO/TiO{sub 2}, (CH{sub 3}){sub 2}SiO/ZrO{sub 2}]

Book · Sat Dec 31 04:00:00 EST 1994

OSTI ID:51668

Babonneau, F ^[1]

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1. Univ. Pierre et Marie Curie, Paris (France). Chimie de la Matiere Condensee

Sol-gel derived siloxane oxide materials are an entirely new family of hybrid systems at the frontier between silicones and glasses or ceramics, with a large variety of potential applications. Better control of the chemistry involved in their preparation should lead to an improvement in their properties, and this requires an investigation of the whole process, from the solution to the final materials. Nuclear Magnetic Resonance is a very suitable technique for this purpose, and this paper will give some illustrations on model systems (CH{sub 3}){sub 2}SiO/TiO{sub 2}, (CH{sub 3}){sub 2}SiO/ZrO{sub 2}, prepared from dimethyldiethoxysilane and titanium or zirconium alkoxides. It is a focused mainly on the use of {sup 17}O solution NMR which clearly shows the formation of Si-O-Ti or Si-O-Zr bonds, but also their disappearance during the aging process. {sup 29}Si MAS-NMR spectra of dried gels confirm that the difunctional units are mainly in polydimethylsiloxane chains, and that the system is phase separated. However, the use of cross-polarization techniques involving {sup 1}H and {sup 29}Si nuclei allows the detection of a small number of units in a more constrained environment, certainly close to oxide-based particles.

• OSTI ID: 51668
• Report Number(s): CONF-940411--; ISBN 1-55899-246-4
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AGING
CHEMICAL BONDS
CHEMICAL REACTION KINETICS
COMPOSITE MATERIALS
EXPERIMENTAL DATA
GELS
MOLECULAR STRUCTURE
NUCLEAR MAGNETIC RESONANCE
SAMPLE PREPARATION
SILOXANES
SYNTHESIS
TITANIUM OXIDES
ZIRCONIUM OXIDES