Mechanical reinforcement and thermal conductivity in expanded graphene nanoplatelets reinforced epoxy composites

► Study of mechanical and thermal properties of graphene nanoplatelets/epoxy composites. ► Processing by high pressure homogenizer and three roll mill to achieve uniform dispersion. ► Fracture toughness increased up to 66% over neat epoxy with EGNP reinforcement. ► Nanoindentation showed steady increase in hardness and modulus of composites. ► Significant improvement in thermal conductivity with incorporation of EGNPs.