Grafting of hyperbranched polymers onto ultrafine silica: postgraft polymerization of vinyl monomers initiated by pendant initiating groups of polymer chains grafted onto the surface

摘要

The grafting of polymers having pendant peroxycarbonate groups onto ultrafine silica surface and the radical postagaft polymerization of vinyl monomers initiated by the initiating groups of polymer chains grafted onto silica surface were investigated. The grafting of polymers having pendant peroxycarboante groups onto the silica surface was achieved by the copolymerization of vinyl acetate (Vac) with t-bytylperoxy-2-methacryloyloxyethylcarbonate (HEPO) initiated by azo groups introduced onto silica surface: the introduction of azo groups onto silica surface was achieved by the reaction of 4,4'azobis(4-cyanopentanoic acid) with amino groups previously introduced onto the surface.