Abstract: This paper investigates systematically the effect and mechanism of talc on the micro-morphology, mechanical properties, heat-resistance and crystallization of PA66/PET alloy. The main conclulions arc as follows: addition of talc (5%一10%)and appropriate assistant agent induces a remarkable
increase in the mechanical properties of PA66/PET alloy; talc can dramatically reduce the size and size distribution of PET phase and plays a role of compatibilizer, this role owes to segmentation and barrier of talc on PET phase; talc decreases the △Hc of PA66 part and increases the △Hc of PET part;increases in strength，stiffness and heat resistance of PA66/PET alloy arc due to the strengthening of talc lamcllar on PA66 matrix and the interface between PA66 and PET, and the toughening effect of talc is related to the decrease in crystallinity of material and the improvement in the compatibility of PA66 and PET.

Key words: polyamidc 66, poly(cthylcnc tcrcphthalatc), talc, micro-morphology, mechanical property, crystallization behavior