Title Adhesion and Dispersion Promoting Treatment for Graphite Nanoflakes
Source Proc. Intl. SAMPE 09 Symp. and Exhib.
Year 2009
Author(s) Allred, R. E.; Barlow, J. P.; Gosau, J. M.; wesson, S. P.; Miller, S. G.
Abstract Graphite nanoflakes are a low cost nanomaterial with interesting 2-D structure. They are produced by exfoliation of bulk graphite and commonly have aspect ratios of 1000:1. Due to the graphitic nature of their surface chemistry, they tend to agglomerate with each other instead of dispersing into organic material, which greatly reduces their usefulness as reinforcements in polymer composites. Adherent Technologies, Inc., under NASA funding, has developed and scaled-up two technologies to treat the nanoflakes for adhesion and dispersion promotion. The first approach uses a reactive finish to induce a chemical bond between the graphite surface and the matrix resin, the second method uses a continuous oxidative plasma process to raise the surface energy. In this paper we describe both approaches, including the scale-up to pound and larger quantities, analytical results of the surface composition based on programmed thermal desorption, and a new application of nanoflakes as fiber-bound fillers.
Keywords epoxy, nanoflakes, graphite, polymer-graphite matrix, reactive finish, continuous oxidative plasma process, nanomaterial