▎ 摘　　要

In this paper, graphene nanosheets (GNS) was synthesized with an improved Hummers' method and the prepared sample was characterized using X-ray diffraction (XRD) and transmission electron microscope (TEM). The current research was mainly focused on the preparation a new-type semiconductive shielding material used in crosslinked polyethylene (XLPE) cable, by adding the GNS and conductive carbon black (CB) into ethylene/vinyl acetate copolymer (EVA). The results showed that the electrical and thermal properties of the composite EVA/CB-GNS was dramatically improved at low GNS loading. GNS reduce the content of conductive filler and improve the smoothness of semiconductive shielding layer of power cable. Meantime, the CB improved the dispersability of GNS in EVA. The volume resistivity of EVA/CB-GNS was decreased to 32.6 Omega.cm, only by adding 1.5wt% GNS and 18wt% CB. The tensile strength and elongation at break of EVA/18CB-1.5GNS was 12.1Mpa and 238.6% respectively, which met the requirements of National Machinery Industrial Standard of China JB/T 10738-2007.