IR and NMR time-resolved studies on the hydrolysis and condensation of methacryloxyalkylsilanes

The sol–gel reactions of the two methacrylate-modified silanes methacryloxymethyltriethoxysilane (MAMTES) and methacryloxypropyltrimethoxysilane (MAPTMS) were followed by using two independent time-resolved spectroscopic methods, viz., IR ATR and NMR with the aim to optimise their pre-hydrolysis tim...

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Veröffentlicht in:	Journal of sol-gel science and technology 2009-03, Vol.49 (3), p.329-335
Hauptverfasser:	Lavrencic Stangar, Urska, Sassi, Alessandro, Venzo, Alfonso, Zattin, Andrea, Japelj, Boštjan, Orel, Boris, Gross, Silvia
Format:	Artikel
Sprache:	eng
Schlagworte:	Ceramics Chemistry Chemistry and Materials Science Colloidal gels. Colloidal sols Colloidal state and disperse state Composites Condensation Exact sciences and technology General and physical chemistry Glass Hydrolysis Inorganic Chemistry Materials Science Nanotechnology Natural Materials NMR Nuclear magnetic resonance Optical and Electronic Materials Original Paper Silanes Siloxanes Sol-gel processes
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Beschreibung
Zusammenfassung:	The sol–gel reactions of the two methacrylate-modified silanes methacryloxymethyltriethoxysilane (MAMTES) and methacryloxypropyltrimethoxysilane (MAPTMS) were followed by using two independent time-resolved spectroscopic methods, viz., IR ATR and NMR with the aim to optimise their pre-hydrolysis times and consequently their use as precursors for hybrid materials. Time resolved measurements were carried out on the two systems under sol–gel conditions. Whereas the hydrolysis of both siloxanes is very fast, condensation proceeds gradually and is not completely finished within 5 h.
ISSN:	0928-0707 1573-4846
DOI:	10.1007/s10971-008-1882-1