Title Physical Properties of Exfoliated Graphite Nanocomposites by Variation of Graphite Surface Functionality
Source Proc. 52nd Intl. SAMPE Symp. and Exhib.
Year 2007
Author(s) Miller, S. G.; Heimann, P. J.; Barlow, J. P.; Allred, R. E.
Abstract The physical and transport properties of epoxy/ graphite nanocomposites are highly dependent on the extent of graphite surface modification. Increased oxidation promotes bonding with the matrix polymer, but at the expense of conductivity. Therefore, it is critical that the polymer-graphite system is tailored to meet multiple property criteria. Three graphite samples of varying functionalization were used in this study. XPS data shows a range of 1% to 13% oxygen content in the samples. The chemical treatments affected both graphite platelet and agglomerate sizes; therefore BET surface area characterization was performed on all samples. By optimizing the nanocomposite interface, improved mechanical and transport properties were obtained. The results indicate graphite dispersion can increase epoxy resin toughness by up to 60% as well as increase electrical conductivity by orders of magnitude.
Keywords epoxy, nanocomposites, graphite, polymer-graphite, BET, epoxy resin toughness, electrical conductivity