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In this article, we investigated the effects of different functional groups in graphene on the mechanical performance of epoxy nanocomposites fabricated using  the in-situ  polymerization method. This study considered pristine graphene and three different varieties of functionalized graphene (–NH 2 , –COOH, and –OH) with varying weight percent (i.e., 0.25, 0.5, and 1.0 wt%). The functional groups grafted of graphene have been confirmed through Fourier transforms infrared (FTIR) spectra. Microstructural features and fracture surfaces were also examined by field-emission scanning electron microscopy with energy-dispersive X-ray spectroscopy. In comparison to pure epoxy, –OH functionalized graphene/epoxy nanocomposites showed a maximum improvement of 37.24% in tensile strength and 38.05% in flexural strength. The improved mechanical properties of epoxy nanocomposites were attributed to homogeneous dispersion, graphene bridging, and better interfacial contact between epoxy and graphene.HIGHLIGHTSThe effect of pristine and functionalized graphene on the mechanical properties of epoxy nanocomposites was studied.Nanocomposites were fabricated for three different wt% (0.25, 0.5, and 1.0) of graphene nanofillers.Field emission scanning electron microscopy (FE-SEM) with EDX was used to examine the microstructural features of fractured surfaces.Graphene enhanced the mechanical properties of epoxy nanocomposites. The effect of pristine and functionalized graphene on the mechanical properties of epoxy nanocomposites was studied. Nanocomposites were fabricated for three different wt% (0.25, 0.5, and 1.0) of graphene nanofillers. Field emission scanning electron microscopy (FE-SEM) with EDX was used to examine the microstructural features of fractured surfaces. Graphene enhanced the mechanical properties of epoxy nanocomposites.

Effects of various functional groups in graphene on the tensile and flexural properties of epoxy nanocomposites: a comparative study