Abstract: Polypropylene (PP) /talc composites were prepared via melt extrusion. The effects of surface modification with silane and the addition of ethylene-octene copolymer (POE) on the mechanical, rheological properties, and microstructure morphology of composites were investigated. It showed that the talc surface modification significantly improved the impact strength of PP. while PP/talc mass ratio was 100/10 and 100/30, the notched impact strength of PP/talc composites increased by 37.8% and 36.4%, respectively, by the silane modification. However, the surface modification of talc decreased the storage modulus. POE promoted the dispersion of talc in PP matrix. The impact strength of the composites increased with increasing POE content.

Key words: polypropylene, talc, silane coupling agent, surface modification, composit