Reactions of a trifunctional silane coupling agent in the presence of colloidal silica sets in polar media

Reactions of 3-glycidoxypropyltrimethoxysilane (GPS) in a water-rich enviro nment with silica colloids were studied. Si-29 NMR spectroscopy was used to monitor quantitatively the variation in GPS hydrolysis, condensation, and adsorption with pH and water concentration. The results show the competitio n between adsorption on the silica surface and condensation polymerization of GPS in the bulk liquid and are used to identify conditions favorable to surface modification. The presence of colloidal silica was shown to increas e the apparent GPS dimerization rate, suggesting either surface catalysis o r an increased local reactant concentration in the electrical double layer around the silica colloids. (C) 1999 Academic Press.