| The high strength and conductive graphene/epoxy resin nanocomposite has been obtained based on single layer (1 nm) graphene prepared by the oxidation and reduction. Several impacts of graphene on the electrical, mechanical and thermal properties of graphene/epoxy resin have been studied in this paper.Single layer graphene oxide was prepared by chemical oxidation and ultrasonication and the layer distance is 1 nm. Fourier Transform Infrared spectroscopy (FTIR) and X-ray Diffraction (XRD) implied the oxygenic groups increased the layer distance of graphite, resulting in a desquamation and formed single layer structure. Atomic Force Microscopy (AFM) and Transmission electron microscopy (TEM) confirmed the graphene oxide was single layer. Ultraviolet-Visible Absorption Spectroscopy (UV), Thermogravimetric Analysis and Raman Spectroscopy confirmed hydrazine hydrate can partly get rid of the oxygenic group in the graphene layers, restore theπ-conjugated structure and make graphene oxide change from insulation to conductor, while the heat eliminates oxygenic group dramatically and reaches higher electrical conductivity.Graphene reduced by two methods was modified by coupling agent, respectively and has produced different functionalized graphene/epoxy resin nanocomposites. The electrical, thermal and mechanical properties of these nanocomposites were studied. The results indicated the graphene partly reduced by hydrazine hydrate modified effectively by coupling agent and dispersed well in the epoxy matrix. The increase in the electrical conductivity of modified graphene/epoxy resin by six orders magnitude compared with neat epoxy was obtained, while the glass transition temperature improved 9℃. Tensile strength and Young's modulus were increased nearly 91.38% and 153.01%, respectively.Hydrazine hydrate reduced graphene (HRG) and purified carbon nanotubes (CNTs) with different ratios were added into epoxy resin. The resultant nannocomposites were characterized to examine the electrical, thermal and mechanical properties. The results indicated HRG and CNTs formed two-dimensional networks structures which can dramatically improve the electrical properties of epoxy resin. These structures can also enhance the mechanical and thermal properties of nanocomposites with the increasing of HRG. While the nanocomposite has the maximum HRG contend, the tensile strength and Young's modulus were increased nearly 97.03% and 93.62%, the shear-bond strength and modulus increased 43.14% and 32.38% and glass transition temperature improved 4.5℃.
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