▎ 摘　　要

Functionalized graphene (FG) was firstly synthesized by reacting graphene oxide (GO) nanosheets with vinyl trimethoxy silane (A-171) and simultaneously reducing by dimethylhydrazine in dimethylformamide (DMF) solvent. Investigation results confirmed that the A-171 molecules were attached on the surface of FG sheets by Si-O-C, meanwhile most of residual oxygen-containing functional groups of GO were reduced and the sp(2)-hybridized structure of graphene was restored. The introduction of A-171 molecules led to an excellent dispersibility and completely exfoliation of FG with a thickness of about 0. 9 nm in the tetrahydrofuran (THF) solvent. Subsequently, FG/silicone composites were prepared via solution blending method. Finally, X-ray diffraction, scanning electron microcopy, dynamic mechanical analysis, thermogravmetric analysis and tensile test were performed to measure the morphology and properties of the FG/silicone composites. Results showed that compared with untreated graphene, FG had a better dispersion in the composites, as well as a stronger interfacial adhesion with silicone matrix. The tensile strength of the composites increased with increasing FG content. When the content of FG reached 0. 5 wt%, the composite showed a tensile strength of 4. 73 MPa, which is 87. 7% higher than that of neat silicone. The 5% weight loss temperature and the glass transition temperature of the composite exhibited a 20. 1 K and 23. 9 K increase by addition of 0. 5 wt% FG.