Abstract
To study the effect of isocyanatosilane coupling agents such as 3-methacryloxypropyl triisocyanatosilane (3-MPSN) on the silica surface, the reactivity of the isocyanato groups with water and adhesive tensile strength of poly (methyl methacrylate) to glass plate and porcelain treated with the silane after immersion in water at 37℃, were measured. The isocyanato groups reacted more strongly with watre than the alkoxy group of 3-methacryloxypropyl trimethoxysilane (3-MPS) confirmed by the adhesive strength of the resin to glass plate and porcelain, and by FTIR-ATR spectroscopy. On the glass plate, multilayers consisting of siloxanol oligomers and/or polymers were produced by hydrolysis of 3-MPSN followed by condensation of the products. Based on the results obtained, it is suggested that better water-resistant adhesion of isocyanatosilanes having active hydrolyzable groups to mineral surfaces groups depends on formation of the siloxane bond between the agents and the mineral substrates and a higher degree of crosslinking in the siloxane phase.
