Modification of polypropylene by two kinds of core/shell composite microspheres

Two kinds of core-shell composite microspheres with different interfacial interaction, polystyrene/MCM-41-g- gamma -methacryloxypropyltrimethoxysilane (PS/MCM-41-g-MPS) and poly(styrene- gamma -methacryloxypropyltrimethoxysilane)/MCM-41 [P(St-MPS)/MCM-41], were added into polypropylene (PP) to improve its properties. The composite microspheres were prepared by using adsorption self-assembly method and co-condensation synthesis method, respectively. The effects of composite microspheres and their loading amount on the mechanical properties and crystallinity of PP composites were investigated. The results show that two kinds of composite microspheres can significantly improve the mechanical properties of PP. The tensile strength of two kinds of PP composites increases 12% and 13% of pure PP when the content of composite microspheres PS/MCM-41-g-MPS and P(St-MPS)/MCM-41 are 2% mass fraction; the impact strength reaches the maximum when the composite microspheres are 4% mass fraction, increases by 68% and 63%, re