Role of Surface-Modified GO Nanoparticles in Strengthening composites

This study investigates the mechanical properties of Epoxy nanocomposites reinforced with Amine Functionalized Graphene Oxide (AGO) and Pristine Graphene Oxide (PGO). The primary objective was to enhance the tensile, flexural, and fracture properties of the nanocomposites by varying the weight percentage of AGO and PGO. Composite samples were fabricated using the liquid resin casting technique with different weight fractions (0%, 0.25%, 0.50%, and 1.0%) of AGO and PGO. Tensile, flexural, and single-edge notch bend (SENB) tests were conducted to evaluate their mechanical performance. The results demonstrated that AGO-reinforced nanocomposites exhibited superior mechanical strength compared to PGO-reinforced nanocomposites. The highest tensile strength was observed at 1.0% AGO (12.91 MPa), while flexural strength was maximum for 0% AGO (75.43 MPa). The fracture toughness (SENB test) was highest for 0% AGO (88.55 MPa) and decreased with increasing AGO content. In contrast, PGO-reinforced nanocomposites exhibited inconsistent trends, with peak tensile strength at 0% PGO (8.93 MPa) and flexural strength at 0% PGO (56.39 MPa). These findings indicate that AGO enhances tensile properties.