The main materials used in this work included electrically
conductive filler CB, grade E900 and PP, grade EPS30R. CB was
obtained from Sichuan Zhenghao Special Carbon Technology Co.
Ltd, with a dibutyl phthalate (DBP) absorption of 260 cm3/100 g,
a density of 1.8 g/cm3, and an original volume resistivity of
0.2 U cm, as given by the manufacturer. PP was a commercial
copolymer of propylene and ethylene with an ethylene content of
6.5 wt% from Dushanzi Petroleum Chemical Company Ltd, with
a volume resistivity of 1.31016 U cm, a melt flow index of 1.5 g/
10 min, and a melting point of about 165 C. CB was dried at 110 C
in an oven for 12 h prior to blending.