Abstract: The rheological behavior ofpolypropylene/poly(ethylene-Octene-1)blends were investigated by means of Advanced Rheology Expansion System(ARES).The results of dynamic rheological tests indicated that the structure of PPand content of POE have obvious effect on the shear rheological bebay-ior of PP/POE blends.With the increase of POE content,the increase degree of the storage modulus and the shear viscosity of PP1/POE blends are less than those ofPP2/POEblendsThe above two blend systems showed greater increase in their storage modulus and the shear viscosity at POE content of twenty to thirty percent and ten to twenty percent respectively when brittle-ductile transition happened. Interfacial slip existed between PP and POE, which was greatly influenced by the compatibility of PF and POE, and the interfacial slip between PP1 and POE was more obvious than that between PP2 and POE.

Key words: poly(ethylene-Octene-1), polypropylene, rheological behavior, blending