The electrical and rheological percolations in the emPP/HDPE/CB ternary composites are reported.The CB particles are selectively located in the HDPE phase.The HDPE/CB phase is conductive with 20 wt% CB.When the contents of HDPE/CB phase in the matrix of emPP increases

the conductive and rheological networks of the emPP/HDPE/CB ternary composites can be found.The results show that the electrical percolation appears when the HDPE/CB content reaches 20 wt%

and the percolation content of the HDPE/CB phase in the emPP matrix is 30 wt% obtained by dynamic rheology.The loss tangent does not show a peak in the frequency sweep until the HDPE/CB phase becomes a continuous phase in the material.This finding indicates that the role of loss tangent peak is not able to give enough information about the formation of the filler network in the ternary system.This may be due to the fact that the relaxation of the phase covers the relaxation of the filler network.We proposed a way to determine the existence of the filler network in the ternary composites.First

determine whether the filler particles form a network in the filler-rich phase by a frequency sweep on this component.Second

use the power-law relationship to determine whether the filler-rich phase forms a network in the ternary composites.