Graphene quantum dots reducing oxidation behavior and mechanical damage of epoxy resin irradiated by γ-rays

Epoxy resin is a widely used polymer. However it will generate highly reactive free radicals when exposed to radiation, which impacts its physical and chemical structure. In this study, graphene quantum dots were integrated into the epoxy resin matrix as free radical scavengers to enhance its stability in irradiated environments. Notably the oxide layer of the epoxy resin measured approximately 480 μm in thickness, whereas that of the GQD/EP nanocomposites was significantly thinner, at about 180 μm. After irradiation, the mechanical properties of the epoxy resin decreased by 49%, and the glass transition temperature decreased by 4.4 °C. In contrast the mechanical properties of GQDs/EP nanocomposites decreased by 35%, and its glass transition temperature decreased by only 2.2 °C. These findings indicate that GQDs nanoparticles can effectively enhance the radiation resistance of epoxy resins. Furthermore, we explored the mechanism by which GQDs scavenge free radicals within the epoxy resin matrix.