Abstract
A kinetic model for the hydrolysis and self- and cross-condensation reactions occuring in two component organically modified silica sols is presented. The hybrid sols were acid-catalyzed mixtures of tetraethoxysilane (TEOS) and organically modified triethoxysilanes (RTES, where RCH 3, C 2H 5 or C 6H 5) reacted with limited amounts of water. The product distributions as a function of reaction time were measured by high resolution 29Si NMR spectroscopy and were simulated using numerical methods. The hydrolysis reactions were reversible whereas the condensation reactions were irreversible. The cross-condensation rates for each of the sols were intermediate to the condensation rates of the individual components. Calculations show that for these sols, the concentration of cross-condensed species is a weak function of relative rates of self-condensation.
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