Organofunctional alkoxysilanes in dilute aqueous solution: new accounts on the dynamic structural mutability

The condensation of alkyltrialkoxysilanes was studied using time-dependent 1H- and 29Si-NMR spectroscopy. The main goal was to correlate the results of these investigations with standard conditions in technical applications of the most commonly used commercial silane adhesion promoters. Thus, experiments with 3-aminopropyltriethoxysilane (DYNASYLAN® AMEO), 3-glycidyloxypropyltrimethoxysilane (DYNASYLAN® GLYMO) and 3-methacryloxypropyltrimethoxysilane (DYNASYLAN® MEMO) were carried out in aqueous solutions at a selected range of concentrations. This investigation reflects a convenient way to determine the total concentration of reactive silanol groups during the course of the reaction. Moreover, the activity of the solution in adhesion promoting processes can be monitored and measured.