Hybrid Sol-Gel Coatings Produced From TEOS and γ-MPS.

SERGIO PELLICE; PABLO GALLIANO; YOLANDA CASTRO; ALICIA DURÁN

Montpellier, Francia.

Conferencia; 6th ESG Conference. 2002 Glass Odyssey.; 2002

University of Montpellier II, Laboratoire des Verres (L.D.V.). Institut du Verre, Paris. European Society of Glass Science and Technology (E.S.G.). Union Scientifique et Technologique du Verre (U.S.T.V.). Groupement de Recherche C.N.R.S. “Matériaux vitreu

The aim of this work was to prepare coatings onto glass slides from polymeric sols. Hybrids sols from tetraetoxysilane (TEOS) and 3-(metacryloxypropil) trimethoxysilane (γ-MPS) were prepared in acid medium for different TEOS/γ-MPS ratios and they were modified by the addition of a colloidal silica suspension and/or titanium alcoxyde. The stability of the different sols was evaluated by viscosity measurements; the sols showed a Newtonian behaviour and the ageing effect is negligible even after two months from their preparation. Coatings were obtained by dipping at different withdrawal rates and heat-treated between 150 and 250ºC. The thickness of the coatings was measured by profilometry and their thermal stability was followed by TGA-DTA. The thermal analysis allows determining the limit temperatures at which the coatings can be treated without loss its hybrid character. Transparent coatings with thickness higher than 4 μm were reached for most of the studied compositions.