Abstract: In this paper, Zrq was applied to modify polypropylene (PP).The tensile strength of PPdecreases when ZrO2 was added, while the notched Charpy impact strength and elongation at break of PP increased considerably. the notched Charpy impact strength of PP reached 13.7 kJ /m2 when the amount of ZrO2 was 0 .3%.the determination of differential scanning calorimeter (DSC) and polarizing optical microscope revealed that the crystallization temperature increased and spherulite sizes of PP decreased with increasing amount of ZrO2 .the (3-crystallite of PP was observed by X-ray diffractometer (XRD) when ZrO2 was added, and the content of (3-crystallite increased with increasing amount of ZrO2.

Key words: polypropylene, zirconia, nucleating agent, morphology, property