Preparation of surface grafting block polymers onto nano silica microspheres and their performance study in acrylic structural adhesive
Using silica microspheres as templates,the surface was modified with active functional groups.By initiating controllable/"active"radical polymerization on the surface,and continuous polymerization of styrene and 2-hydroxyethyl methacrylate,nano silica microspheres grafted with block polymers on the surface were obtained,which were then characterized.The surface modified silica microspheres were used in acrylic structural adhesive system and they were compared with the unmodified silica microsphere system.The research results showed that the target product was synthesized successfully through structural characterization.The surface modified silica microspheres were used in the acrylic structural adhesive system,and the performance of polymer modified nano silica in tensile strength,elongation at break,and shear strength was superior to that of unmodified nano silica.Nano silica had the strengthening and toughening effect in the curing system,and its performance was better after surface grafting for polymer modification.
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