Epoxy nanocomposites with high mechanical and tribological performance

Small ceramic particles are known to enhance the mechanical and tribological properties of polymers. Introduced into an epoxy resin, the filler morphology, size, particle amount and the dispersion homogeneity influence extensively the composite's performance. In the present study, various amounts of micro- and nano-scale particles (calcium silicate CaSiO3, 4-15 mum, alumina Al2O3, 13 nm) were systematically introduced into an epoxy polymer matrix for reinforcement purposes. The influence of these particles on the impact energy, flexural strength, dynamic mechanical thermal properties and block-on-ring wear behavior was investigated. If the nanoparticles were incorporated only, they yield an effective improvement of the epoxy resin at a nanoparticle content of already 1-2 vol.% Al2O3. Choosing the nanocomposite with the highest performance Lis a matrix, conventional CaSiO3, microparticles were further added in order to achieve additional enhancements in the mechanical properties. In fact, synergistic effects were found in the form of a further increase in wear resistance and stiffness. Several reasons to explain these effects in terms of reinforcing mechanisms were discussed. (C) 2003 Elsevier Ltd. All rights reserved.