Abstract: PP/PET/EPDM-g-GMA blends were prepared via reactive melt blending. The morphology of the blends was analysized using SEM and image processing software, which confirmed that the compatibility of PP and PET was improved by EPDM-g-GMA，Isothermal crystallization of the blends were observed using polarizing microscope, it was found that the dimension and distribution of the spherulites became finer via using nucleating agent. The dimension of PP spherulites decreased with the inclusion of PET.  EPDM-g-GMA not only compatibilized but also toughened the system,  making the impact strength increased from 2 .2kJ/mzto6 .5kJ/m2 and the tensile modulus increased by 38 .6%compared with neat PP. The tensile strength decreased with increasing PET content, YP/PET/EYDM-g-GMA had no obvious effect on this property.

Key words: polypropylene, polyethylene terephthalate, blending, morphology, mechanical property