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Irradiation-induced surface graft polymerization onto calcium carbonate nanoparticles and its...

By Friedrich, Klaus; Ma, Chuan Guo; Rong, Min Zhi; Zhang, Ming Qiu
Publication: Polymer Engineering and Science
Date: Friday, April 1 2005

Nano-sized calcium carbonate was pretreated with silane coupling agent and then mixed with butyl acrylate that is of larger amount than the nanoparticles. Under [gamma]-irradiation, graft polymerization occurred on the nanoparticle surface, forming a nanocomposite structure consisting of grafted poly(butyl acrylate) (PBA), homopolymerized PBA, and the segregated nanoparticles. It was found that the silane pretreatment significantly promoted the graft reaction. When the grafted nano-CaC[O.sub.3] particles were melt compounded with polypropylene (PP), an obvious synergistic effect, offered

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