▎ 摘　　要

NOVELTY - Edge-modified graphene, has an average sheet diameter of 2-30 mum, and an average aspect ratio of 600-10000:1, conductivity of 200-800 S/m. The oxygen content in terms of oxygen element in the edge-modified graphene is 3-30 at.%, and the hydrogen content in terms of hydrogen element is 1-10 at.%. USE - Edge-modified graphene used as antistatic agent and cell nucleating agent, preferably for polyolefin articles (all claimed). ADVANTAGE - The edge modified graphene has good sheet integrity, is easy to form a good conductive network, and has green and eco-friendly preparation method and cost-effective. The method has short reaction period and simple to process. The antistatic agent is simple and operable, is easy for industrial popularization, and has good economic and social benefits. DETAILED DESCRIPTION - Edge-modified graphene, has an average sheet diameter of 2-30 mum, and an average aspect ratio of 600-10000:1, conductivity of 200-800 S/m. The oxygen content in terms of oxygen element in the edge-modified graphene is 3-30 at.%, and the hydrogen content in terms of hydrogen element is 1-10 at.%. INDEPENDENT CLAIMS are included for: (1) A polyolefin composition, which comprises a polyolefin and the edge-modified graphene, where the edge-modified graphene is present in an amount of 0.05-5 pts. wt., preferably 0.1-2 pts. wt., based on 100 pts. wt. polyolefin. (2) A polyolefin expanded bead, is obtained by foaming the polyolefin composition, after granulation. (3) A polyolefin expanded bead molded body, is obtained by molding the polyolefin expanded bead.