Abstract: Non-isothermal crystallization behavior of molten polypropylene catalloys(PP-c) was studied by using differential scanning calorimetry(DSC).Besides, crystallization process and spherulite morphology were observed through polarized optical microscopy.Compared with pure polypropylene(PP), the crystallization peak temperature(t_c^p) of PP-c shifted to a higher temperature, and the value of t_c^p became bigger with the increase of ethylene component in PP-c.The spherulitic geometrical dimension of PP-c decreased distinctly, and the number of spherulite augmented obviously.It is believed that the ethylene component acts as the heterogeneous nucleation agent in PP-c.

Key words: Polypropylene catalloy(PP-c), Polypropylene(PP), Ethylene component, Crystallization behavior