Dispersion of graphene nanoplatelets and its effect on the properties were investigated by fabricating epoxy/graphene nanocomposite via isolation method of high speed mechanical mixing and combination method of mechanical mixing and bath sonication. Flexural properties, fracture properties and density measurement of nanocomposites were determined with different graphene loadings (0 vol%, 0.2 vol%, 0.4 vol%, 0.6 vol%, 0.8 vol% and 1 vol%). The improvement in the dispersion of graphene nanoplatelets was reflected in enhanced flexural and fracture properties of the nanocomposite. Much enhancements on properties of nanocomposite fabricated using bath sonication compared to using high speed mechanical mixing only. This indicating that bath sonication was superior to mechanical mixing with regard to dispersing graphene nanoplatelets in epoxy matrix.
