▎ 摘　　要

Graphene nanosheets (GNs) often results in incompatibility with the hydrophobic polymer matrix, and the tendency to form aggregates during processing. Herein, hyperbranched polycaprolactone modified GNs (PGNs) was obtained using 3,4,9,10-perylenetetracarboxylic acid anhydride (PTCDA)reacted with GNs and caprolactone. Firstly, pi-pi stacking interactions between GNs and perylenebisimide derivatives (PBI), and then in-situ polymerization of epsilon-caprolactone. The structure and characteristic of PGNs were investigated by infrared spectroscopy, wide angle X-ray diffractometry, thermogravimetric analysis and ultraviolet spectrum. PGNs was added into epoxy matrix at different contents to improve the mechanical and thermal properties of epoxy. At 1.0 wt.% PGNs content, the impact strength and tensile strength of PGNs/epoxy composites were 43.41 kJ/m(2) and 91.60 MPa. Compared with those of pure epoxy, these value increased by 148% and 87%, respectively, as well as the T-g increased by about 20 degrees C.