Preparation and Properties of iPP/nano-CaCO3/PP-g-GMA Composite
Using isotactic polypropylene(iPP),nano calcium carbonate(nano-CaCO3)and glycidyl methacrylate grafted impact copolymer polypropylene(PP-g-GMA)as raw materials,iPP/nano-CaCO3/PP-g-GMA composite was prepared by melt blending method.The effects of PP-g-GMA on the mechanical properties,crystallization behavior and microstructure of iPP/nano-CaCO3/PP-g-GMA composite were studied,and its toughening mechanism was analyzed.The results show that PP-g-GMA and nano-CaCO3 have a synergistic toughening effect.When the dosage of both is 40.0 phr,the impact strength of iPP/nano-CaCO3/PP-g-GMA composite at 23℃ is about 6.9 times that of pure iPP.Both PP-g-GMA and nano-CaCO3 have nucleation effects,promoting the refinement of the spherulites in the matrix.The rubber phase in PP-g-GMA is dispersed in the form of spherical islands in iPP,playing a toughening role.
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