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Titolo:
Nuclear magnetic resonance techniques for the structural characterization of siloxane-oxide hybrid materials
Autore:
Babonneau, F; Maquet, J;
Indirizzi:
Univ Paris 06, CNRS, F-75252 Paris 05, France Univ Paris 06 Paris France05 v Paris 06, CNRS, F-75252 Paris 05, France
Titolo Testata:
POLYHEDRON
fascicolo: 3, volume: 19, anno: 2000,
pagine: 315 - 322
SICI:
0277-5387(20000215)19:3<315:NMRTFT>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
ANGLE-SPINNING NMR; 3-DIMENSIONAL LATTICE CONNECTIVITIES; COSY 2D EXPERIMENTS; SOLID-STATE NMR; O-TI BONDS; SI-29 NMR; ALKOXYSILANE POLYMERS; CONDENSATION-REACTIONS; CHEMICAL HOMOGENEITY; QUADRUPOLAR NUCLEI;
Keywords:
sol-gel; NMR; hybrid materials; siloxane; silicon-29; oxygen-17;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
53
Recensione:
Indirizzi per estratti:
Indirizzo: Babonneau, F Univ Paris 06, CNRS, 4 Pl Jussieu, F-75252 Paris 05, France Univ Paris 06 4 Pl Jussieu Paris France 05 Paris 05, France
Citazione:
F. Babonneau e J. Maquet, "Nuclear magnetic resonance techniques for the structural characterization of siloxane-oxide hybrid materials", POLYHEDRON, 19(3), 2000, pp. 315-322

Abstract

The objective of this paper is to discuss the appropriateness of various solution and solid state NMR techniques to describe structural aspects of siloxane-oxide hybrid systems prepared by sol-gel processes. Co-hydrolysis oforganosilanes and metallic alkoxides can promote either self-condensation or co-condensation reactions between the different precursors, and this will control the structural homogeneity of the final network. Solution state Si-29 and O-17 NMR can give unique information on the formation and stability of co-condensing species. In the final gels, solid state Si-29 MAS used in conjunction with cross-polarization (CP) and related two-dimensional Si-29-H-1 heteronuclear NMR correlation techniques, provides detailed information on dipole-dipole coupled Si-29 and H-1 species among different molecularmoieties. Finally, the use of O-17 MAS NMR with the newly developed MQ MASsequence that provides a direct identification of the various oxo bridges will be discussed. (C) 2000 Elsevier Science Ltd All rights reserved.

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Documento generato il 11/07/20 alle ore 07:41:29