The Influence of High Content Nano-Al₂O₃on the Properties of Epoxy Resin Composites

Abstract

Abstract The nano-alumina (nano-Al2O3) particles were modified by silicon coupling agent KH-550, and the epoxy matrix nanocomposites were prepared by using nano-Al2O3 as reinforcing agent. The dispersion status was studied by transmission electron microscope (TEM). On this basis, effects of nano-Al2O3 content on dielectric and mechanical properties of the nanocomposites were studied. Morphologies of the fracture surface of nano-Al2O3/epoxy composites were observed by scanning electron microscope (SEM). As a result, the mechanical properties reached to the best when the nano-Al2O3 content is 20%. The impact strength, flexural modulus and flexural strength increased by 84%, 29% and 18% respectively. The relative dielectric constant and the dielectric loss tangent were increased with nano-Al2O3 content. Keywords: Dielectric propertiesEpoxy resinMechanical propertiesNano-alumina (nano-Al2O3)Nanocomposites