▎ 摘　　要

In this article, cyanuric chloride (CC) and hexamethylenediamine (HMD) as raw material, the grafting of hyper-branched polytriazine onto reduced graphene oxide surface (HBP-RGO) was achieved by the repeated nucleophilic substitution between chlorine groups of CC and amino groups of HMD, respectively. The Fourier transform infrared, X-ray photoelectron spectroscopic, Raman, transmission electron microscopic, thermogravimetric, and atomic force microscopic analysis showed that HBP-RGO had been successfully prepared and the HBP had a dendritic structure on the surface of RGO. And then, the HBP-RGO was added into polystyrene (PS) and the HBP-RGO/PS composite was prepared by solution mixing.The micro-morphology, thermal stability, and electrical conductivity of RGO/PS and HBP-RGO/PS composites were characterized and compared. The scanning electron microscopic analysis showed that the HBP-RGO can uniformly disperse in PS. Meanwhile, the HBP-RGO/PS composite showed good thermal stability and electrical conductivity, the percolation threshold of the composites is low as 0.32 vol %. (C) 2015 Wiley Periodicals, Inc.