▎ 摘　　要

The reinforcement of graphene nanoplatelets produces superior mechanical and thermomechanical properties in the epoxy nanocomposites. The nanocomposites with different proportions of pristine GNP (pGNP), amine functionalised GNP (NH2-fGNP) and carboxyl functionalised GNP (COOH-fGNP) were fabricated by magnetic stirring and ultrasonication. The attached carboxyl and amine groups formed covalent and non-covalent bonding with the epoxy matrix which aids in the uniform dispersion of the nanofillers in the polymer as compared to the pristine GNP. The improvement in the mechanical and thermomechanical properties was exhibited due to the better interfacial bonding and effective stress transmission between GNP and matrix because of the improved distribution of nanoparticles. The improvement of 14% and 10% was obtained in the nanocomposites with amine and carboxyl fGNP, respectively, as compared to the pure epoxy. Similar trends were even noticed in the results of the dynamic mechanical analysis. The surface morphology of the fractured samples was studied through scanning electron microscopy which provided the better interfacial bonding due to the modification of the GNP. The shape memory effect in the hybridised nanocomposites was evaluated by heat stimulated bending tests which showed encouraging results of shape fixity and shape recovery of 92% and 96%, respectively.