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 SiOC

meanwhile most of residual oxygen-containing functional groups of GO were reduced and the sp2-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.