Abstract: Scanning electron microscopy(SEM)，differential scanning calorimctry (DSC) and mcchanical performance testing were used to investigate the compatibilization of polypropylene(PP)Polyamidc6(PA6)blends containing various polypropylene grafted malcic anhydride and vinyl acetate(PP-g-
MAH/VAc.SEM images indicated that the domains of PA6 dispersed in the PP/PA6/PP-g-(MAH/VAc) blends were significantly reduced to less than 5 μm.As 8%PP-g-MAH/VAc graft polymer with5.3%malcic anhydride-co-vinyl acetate was added as a compatibilizer in the blend of PP(80%)and Pn6 (20%)，its elongation at break, tensile strength，and notched impact strength reached 558%，60.88 MPa, and to 5.28 kJ /㎡，respectively. The improved compatibility in PP/PA6/PP-g-(MAH/VAc) blends was attributed to the formation of PP/PA6 copolymer by chemical reactions between anhy-
dridc of MAH in PP-g-(MAH/VAc) and terminal amino groups of PA6 during the melt mixing, as confirmed by FTIR results.

Key words: polypropylene, polyamide 6, graft copolymer, compatibilization