{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}]
- 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; TRN: 95:012029
- Resource Relation:
- Conference: Spring meeting of the Materials Research Society (MRS), San Francisco, CA (United States), 4-8 Apr 1994; Other Information: PBD: 1994; Related Information: Is Part Of Better ceramics through chemistry VI. Materials Research Society symposium proceedings Volume 346; Cheetham, A.K. [ed.] [Univ. of California, Santa Barbara, CA (United States)]; Brinker, C.J. [ed.] [Sandia National Labs., Albuquerque, NM (United States)]; Mecartney, M.L. [ed.] [Univ of California, Irvine, CA (United States)]; Sanchez, C. [ed.] [Univ. Pierre et Marie Curie, Paris (France)]; PB: 1069 p.
- Country of Publication:
- United States
- Language:
- English
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