Abstract
The hydrolysis and condensation mechanisms of a silane coupling agent in the presence of colloidal silica were investigated with 29Si and 13C NMR. The influence of colloidal silica on the reaction is acceleration of the hydrolysis of the methoxy group of the silane coupling agent and, conversely, deceleration of the condensation of the hydrolyzed species. After 56 days, the main products are oligomeric species in the presence of colloidal silica, although mainly polymeric species are produced when the colloidal silica is absent. These results may derive from the acidic character of the colloidal silica.
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