The rheological property of HDPE/EVA system filled with carbon black(CB) is studied with Advanced Rheology Expand System(ARES). It is found that the appearance of the solid-like “second plateau” and the peak of loss factor in the low frequency region as well as the strong shear thinning effect are all related to the network formed by the interactions between particles and particles/polymer chains. The accelerated increase of complex viscosity with increasing of filler loading above 20 phr indicates that a rheological percolation structure of the filler has formed. Irradiation with gamma-ray affects the rheological behavior of the system greatly

i.e.

the peak of loss factor disappears and the dependence of the G′ on frequency becomes smaller

indicating cross-linking of the polymer molecules. At dose of 100 kGy an abnormal behavior is observed which can be partly attributed to the degradation of polymers.