Abstract

Graft polymerization of styrene on phosphate-modified calcium carbonate was accomplished by two methods: (i) initiation from the surface and (ii) copolymerization with the monomeric units attached to the surface. The two organic dihydrogen phosphates carrying reactive azo groups afforded graft polystyrene in excellent graftivities and graft efficiencies, whereas the grafting parameters in graft polymerization on the phosphate containing methacrylate group using azobisisobutyronitrile were relatively so small. The graft polystyrene was characterized by infrared spectroscopy, thermal analyses (TG-DTA), and scanning electron micrography.

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