Enhanced ultra violet resistance of epoxy nanocomposites filled with liquid-like graphene oxide/silicon dioxide nanofluid

The ultra violet (UV) resistance of epoxy resins has been paid more and more attention, and the development of highly efficient UV resistant materials is critical. Therefore, we showed liquid-like graphene oxide (GO)/silicon dioxide (SiO 2 )-based derivatives for UV resistance of epoxy resins. To be specific, SiO 2 nanoparticles were deposited in situ on the surface of GO. Subsequently, a black, homogeneous and solvent-free GO/SiO 2 nanofluid was prepared by grafting organosilanes (KH560) and polyetheramines (M2070) on the surface of GO/SiO 2 . Furthermore, the solvent-free GO/SiO 2 nanofluid/epoxy resin composites were also prepared. The bending properties before and after UV irradiation of the nanocomposites at room temperature were investigated to reveal the role of the interphase. The toughening mechanism of GO/SiO 2 nanofluid was elucidated by observing the fracture surface. As expected, the loss of bending strength of the resin resulting from UV illumination was efficiently reduced by the GO/SiO 2 nanofluid. This may be attributed to the excellent anti-UV aging properties of GO and SiO 2 nanoparticles. Moreover, the GO/SiO 2 nanofluid can provide excellent bending resistance for epoxy resin both before and after illumination, owing to its great compatibility with epoxy resin by organic chains and hindrance to crack propagation by nano cores. The epoxy nanocomposites filled with liquid-like GO/SiO 2 nanofluid can effectively reduce the loss of bending strength of the epoxy nanocomposites resulting from UV irradiation and improve the UV resistance of the epoxy nanocomposites.