Abstract: Polypropylene/calcium carbonate-maleic anhydride-polypropylene wax(PP/CaCO3-MAH-PPW) composites were prepared by means of in situ solid phase graft copolymerization using MAH and PPW as the main raw materials. Compared with PP/PP-g-MAH/CaCO3 composites using MAH grafted with PP(PP-g-MAH) as compatibilizer, PP/CaCO3-MAH-PPW composites exhibit higher impact resistance, bending and processing properties. The results show that a good dispersion of calcium carbonate and an appropriate interface bonding between CaCO3 and PP are the key factors in order to obtain the composite with good toughness. When m(PP)∶m(CaCO3)=100∶20, the notched impact strength of PP/CaCO3-MAH-PPW composite reaches a maximum, which is 1.19 times as high as that of the matrix resin.

Key words: Composites, Polypropylene, Calcium carbonate, In situ solid phase graft copolymerization, Polypropylene grafted with maleic anhydride