Solid-state shear compounding technology(S5C) based on pan-milling is an effective method to prepare polymedgraphite electrical conductive composites with nano intercalating structure．The graphite nanosheets may touch each other to form a conductive network

and the intercalating graphite layers with nano scale gaps may induce tunnel current．therefore the percolation threshold value of the composites decreases remarkably

and their electfical conductivities increase quite a lot at low graphite loading levels．Compared with the PP／graphite composite prepared via conventional melt mixing

the percolation threshold of the PP／YEP250 nanocomposites prepared via S3C decreases from 4.3 vol％ to 0.55 vol％

and their conductivity is in 10 magnitudes of order higher than that of conventional PP/graphite composites at a graphite content of 4.01 vol％．