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Structural Investigation of Sol-Gel-Derived Hybrid Siloxane-Oxide Materials Using 29Si MAS-NMR Spectroscopy

Published online by Cambridge University Press:  25 February 2011

F. Babonneau ,
L. Bois ,
J. Livage  and
S. Dire
F. Babonneau
Affiliation:
Chimie de la Matière Condensée, Université Paris 6, 4 place Jussieu, 75252 Paris, France
L. Bois
Affiliation:
Chimie de la Matière Condensée, Université Paris 6, 4 place Jussieu, 75252 Paris, France
J. Livage
Affiliation:
Chimie de la Matière Condensée, Université Paris 6, 4 place Jussieu, 75252 Paris, France
S. Dire
Affiliation:
Dipartimento di Ingegneria dei Materiali, Universita di Trento, 38050, Mesiano-Trento, Italy
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Abstract

Hybrid siloxane-oxide systems were prepared by sol-gel techniques. Siloxane precursors are either monomeric species, dimethyldiethoxysilane, or OH-terminated polydimethylsiloxanes. The oxide component is introduced via metallic alkoxides, M(OR)n (M=Si, Ti, Zr). Transparent materials from flexible to brittle gels, can be obtained over a large M/siloxane range. The structure of the various systems was investigated by 29Si MAS-NMR. The signals due to the difunctional Si units, (CH3)2SiO, depend strongly on the nature of M and on the M/siloxane ratio. Structural models are proposed, ranging from single phase systems with highly interconnected siloxane and oxide units, to nanocomposites made of polysiloxane chains crosslinked with oxide-based particles.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 286: Symposium J – Nanophase and Nanocomposite Materials , 1992 , 289
Copyright
Copyright © Materials Research Society 1993

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References

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