▎ 摘　　要

In this study, octadecylamine-functionalized graphene oxide (GO-ODA)/epoxy nanocomposites were fabricated via vacuum shock technique and effect of GO functionalization on thermal and mechanical properties of the nanocomposites was examined. In this case, for characterization of functionalization of GO nanosheets, Fourier transform infrared spectroscopy (FTIR) and Raman analysis were used. X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analyses indicate uniform dispersion of nanoparticles throughout the matrix. Despite this, the results of SEM analysis confirmed the significant effect of the vacuum shock technique on bubbles reduction, which affected thermal and mechanical properties of composites. Thermogravimetric analysis (TGA) showed the increase in onset degradation temperature and better thermal stability for the GO-ODA/epoxy nanocomposites in comparison to GO/epoxy nanocomposite and neat epoxy. The maximum thermal degradation temperature for epoxy resin was increased from 356 oC to 365 A degrees C. Besides, the addition of 0.5 wt% GO-ODA within the matrix increased the tensile and flexural strength of epoxy resins by 104 % and 75 %, respectively, due to the well dispersion and strong interfacial interactions between GO-ODA and epoxy resin through covalent functionalization. The toughening effect of GO-ODA was explored in epoxy nanocomposites and found to be significant (251 %) in improving the impact strength of specimens.