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Titolo:
POLYMERIZATION REACTIONS IN METHYLTRIETHOXYSILANE STUDIED THROUGH SI-29 NMR WITH POLARIZATION TRANSFER
Autore:
BRUNET F;
Indirizzi:
CTR ETUD SACLAY,CEA,SERV CHIM MOL,CNRS,URA 331 F-91191 GIF SUR YVETTEFRANCE
Titolo Testata:
Journal of non-crystalline solids
fascicolo: 1-2, volume: 231, anno: 1998,
pagine: 58 - 77
SICI:
0022-3093(1998)231:1-2<58:PRIMST>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
NUCLEAR MAGNETIC-RESONANCE; SOL-GEL POLYMERIZATION; INITIAL POLYCONDENSATION PROCESSES; ORGANO-SILICON GELS; COSY 2D EXPERIMENTS; ALKOXYSILANE POLYMERS; SUBSTITUTED ETHOXYSILANE; CONDENSATION PROCESS; HYDROLYSIS; INEPT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
56
Recensione:
Indirizzi per estratti:
Citazione:
F. Brunet, "POLYMERIZATION REACTIONS IN METHYLTRIETHOXYSILANE STUDIED THROUGH SI-29 NMR WITH POLARIZATION TRANSFER", Journal of non-crystalline solids, 231(1-2), 1998, pp. 58-77

Abstract

Si-29 nuclear magnetic resonance (NMR) spectroscopy was used to identify and characterize the alkoxysilane polymers formed in the early stages of the hydrolysis and condensation reactions of methyltriethoxysilane (MTES) dissolved in ethanol. The distortionless enhancement by polarization transfer (DEFT) experiments were tuned for optimum sensitivity, quantitative information and also used as editing methods for Si-29 spectra of various oligomers. The structures of polymers were identified, including various linear oligomers up to tetramers and cyclic species with three and four silicon atoms. The proportion of cyclics andcagelike structures is more important with an excess of water. It is shown that the hydrolysis ratio and the pH affect the hydrolysis rate of the species formed. (C) 1998 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 11/07/20 alle ore 07:03:03