Synthesis of Styryl- and Methacryloxypropyl-Modified Silica Particles Using the Hydrolytic Sol-Gel Method and the Miniemulsion Polymerization Approach

摘要

The hydrolytic sol-gel route has been used to obtain a range of organically modified silica particles of sub-micron diameter. A modified Stober method has been adapted to prepare styryl-and methacryloxypropyl-modified silica particles with diameters in the range of 200-1000nm by base-catalyzed hydrolysis and condensation reactions of organotrialkoxysilane precursors at ambient temperature, The size of these particles is considerably larger than that of silsesquioxane particles produced in this way from organically modified precursors containing less bulky organic groups, such as methyl or ethyl groups. The particles have been stabilized against aggregation by the use of surfactants Nearly monodisperse methacryloxypropyl- modified silica particles with diameters in the range of ca 40-900 nm were produced by the miniemulsion polymerization method using a range of surfactants and hexadecane to suppress Ostwald ripening A range of potential applications for these hybrid nanocomposite materials includes their use as modifiers of the properties of selected polymer systems, such as acrylic and styrenic polymers or coatings.