Abstract: MMT modified poly(butyl acrylate) grafted poly(methyl methacrylate) coreshell structured copolymer modifier (P(BA-g-MMA)) was prepared by seeded emulsion polymerization as a reinforcer for PVC resin. The effect of MMT on mechanical properties of the system was investigated. The intercalation and dispersion effect of montmorillonite were observed by X-ray diffraction and scanning electron microscopy. Xray diffraction analysis indicated that polymerization of monomers occurred between the interlayer of MMT, which resulted in the increasing of interlayer space from 1.25 to 1.5 nm. When the ratio of coreshell in P(BA-g-MMA) was 85∶15 and the loading of P(BA-g-MMA) in PVC was 9 phr, the impact strength of PVC/P(BA-g-MMA) blend reached 1106 J/m, providing a typical ductile fracture.

Key words: poly（vinyl chloride）, poly (buty1 acrylategraftedmethy1 methacrylate) coreshell copolymer, montmorillonite, toughness, mechanical property