The effect of phase morphology on mechanical properties of the immiscible blends of PA1010/PP have been studied via dynamic packing injection molding (DPIM).The tensile strength

tensile modulus and notched impact strength were found largely increased by means of shear.When the content of PP was 20%

the izod impact strength of dynamic samples was 21.3 kJ/m2

which was more than 3 times that for the static samples.The tensile strength of dynamic samples was 50.9 MPa when the content of PP was 20%

which was 1.5 times that for the static samples.SEM results showed that the shear-induced morphology with core in the center and shearing layer surrounding the core was observed in the cross-section areas of the specimens.SEM results also indicated a remakably decrease of domain size and more uniform dispersion of the dynamic molded specimens

especially when the content of PP was 20%

the domain size decreased from about 3.9 μm to about 1.4 μm.The observed higher mechanical properties in dynamic samples could be due to the effect of phase morphology under shear stress.The tensile strength of dynamic samples is higher than that of static samples in the whole composition region due to the molecular orientation induced by shear stress in DPIM

and the toughing mechanism lies in shearing-induced smaller domain size and the molecular orientation induced by shear stress in DPIM.