▎ 摘　　要

NOVELTY - Making polyolefin-carbon nanomaterial composite comprises: mixing graphene nanoplatelets with low density polyethylene powder to form mixture, where 95 wt.% the particles of polyethylene powder have particle size of less than 500 mu m; ball milling the mixture in high-energy shaker to form composite powder; molding the composite powder to form composite plate; and subjecting the composite plate to an AC voltage of 1-50 kV to form the polyolefin-carbon nanomaterial composite, the AC voltage is applied to the composite plate through needle electrode disposed inside the composite plate while the composite plate is disposed on supporting ground electrode so that the needle electrode does not contact the supporting ground electrode and the supporting ground electrode and the needle electrode are separated by distance of at least 30% of thickness of composite plate, and the supporting ground electrode, the composite plate and the needle electrode are immersed in non-conductive liquid medium. USE - The method is useful for making a polyolefin-carbon nanomaterial composite. ADVANTAGE - The method provides the composite with electrical and thermal conductivity higher than the parent polyolefin by the incorporation of a carbon nanomaterial and nanocomposite material with electrically conductive pathways, e.g. formed from application of AC voltage. DETAILED DESCRIPTION - Making a polyolefin-carbon nanomaterial composite comprises: mixing graphene nanoplatelets with a low density polyethylene powder to form a mixture, where 95 wt.% the particles of the polyethylene powder have a particle size of less than 500 mu m; ball milling the mixture in a high-energy shaker to form a composite powder; molding the composite powder to form a composite plate; and subjecting the composite plate to an AC voltage of 1-50 kV to form the polyolefin-carbon nanomaterial composite, the AC voltage is applied to the composite plate through a needle electrode disposed inside the composite plate while the composite plate is disposed on a supporting ground electrode such that the needle electrode does not contact the supporting ground electrode and the supporting ground electrode and the needle electrode are separated by a distance of at least 30% of a thickness of the composite plate, and the supporting ground electrode, the composite plate, and the needle electrode are immersed in a non-conductive liquid medium, the composite has oriented electrically and thermally conductive pathways that comprise dendritic conductive channels in the polyethylene matrix which terminate at and originate from at least one selected from the group consisting of an exterior surface of the polyolefin-carbon nanomaterial composite, a channel created by the needle electrode, and a graphene nanoplatelet.