Buckling Analysis and Research on Properties of Epoxy Resin Nanocomposites with SiO2/Graphene Oxide
Vol. 56, No. 3, pp. 162-170,
Jun. 2019
10.12772/TSE.2019.56.162
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Abstract
In this study, graphene oxide(GO) was synthesized using Hummer’s method. Then, silica nanoparticles-coated GO(SiO2/GO) were synthesized by in-situ sol-gel synthesis under a water-alcohol mixture at room temperature (25oC). GO and SiO2 were used as additives in epoxy resin nanocomposites that were prepared by mixing Tetraglycidyl diamino diphenyl methane(TGDDM) and hardner(M-DEA+M-MIPA). Fourier transform infrared(FT-IR) spectra and X-ray photoelectron spectroscopy (XPS) of SiO2/GO were conducted. Thermal and mechanical properties of epoxy resin nanocomposites were confirmed by analytical methods such as TG-DTA, DMA, fracture toughness, and tensile strength. The fracture surfaces of epoxy resin nanocomposites with different contents of
GO and Si02/GO were observed by a Scanning Electron Microscope(SEM). The mechanism for mechanical properties of epoxy resin nanocomposites was analyzed by modeling of nanocomposites with different GO and SiO2 weights. Due to the GO, both the heat resistance and the glass transition temperature of the epoxy resin nanocomposites were improved. Interestingly, when 0.1 wt% of GO was added to the epoxy resin/hardener mixture, the mechanical properties increased compared to that of neat epoxy resin. There results were caused by an aggregation between the GO and GO/SiO2. Based on the analysis of the mechanical properties of SiO2 addition, buckling analysis was performed and the critical load and buckling shape were confirmed.
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