Polymer-assisted liquid exfoliation of graphite is a promising technique for the scale production of defect-free graphene. In this paper, graphene nanosheets (less than 5 layers, with lateral size about 500–1500 nm) were successfully produced by directly exfoliating graphite in low boiling point chloroform, in the presence of hydrocarbon polymers such as linear paraffin wax and hyperbranched polyethylene. The effect of polymer topological structure, molecular weight, initial graphite concentration, the ratio of polymer and graphite on the exfoliation has been investigated in detail. CH-π interaction between the hydrocarbon polymers and aromatic structure in graphite, together with the steric repulsion and solubility of absorbed polymer, facilitating the exfoliation and stabilization of graphene sheets. C–H bond involved in CH-π interaction was mainly originated from methylene (-CH₂-) group, which has been revealed by nuclear magnetic resonance technique. This work is of practical importance for the understanding of mechanism in polymer-assisted liquid exfoliation of graphite.

石墨的聚合物辅助剥离技术是大规模生产无缺陷石墨烯的有前途的技术。在本文中，通过在低沸点氯仿中直接剥落石墨，并在碳氢聚合物（如线性石蜡和超支化聚乙烯）存在下，成功地制得了石墨烯纳米片（少于5层，横向尺寸约为500-1500 nm）。详细研究了聚合物的拓扑结构，分子量，初始石墨浓度，聚合物与石墨的比例对剥离的影响。碳氢化合物聚合物与石墨中的芳族结构之间的CH-π相互作用，以及空间排斥和被吸收的聚合物的溶解度，有助于石墨烯片的剥落和稳定化。_2-）组，其已经通过核磁共振技术揭示。这项工作对于理解聚合物在石墨中辅助液体剥离的机理具有重要的现实意义。