Graphite Fiber Composites Reinforced With Nanopaticles

Abstract

Graphite nanoplat elets (GNPs) with thicknesses in the order of less than 100 nm can be used to improve both mechanical and electrical properties of polymers. Their integration into the matrix resin is expected to improve the properties of structural composites as well. The refore, a manufacturing process was developed to incorporate graphite nanoplatelets (GNPs) into graphite fiber composites. The process consist s of the following two sequential steps: deposition of GNPs onto graphite fabric followed by resin transfer moldin g. Graphite nanoplatelets were deposited on graphite fabric layers using an electrostatic spraying method. These fabric layers were then stacked and impregnated with an epoxy resin using a resin transfer molding process. Two types of GNPs were used: as -rec eived and nitric acid treated. As -received GNPs were deleterious to composite properties whereas acid -treated GNPs were beneficial. With just 1 vol% addition of treated GNPs, the in -plane shear strength increased 11% over the corresponding strength witho ut GNPs. However, electrical conductivity was not increased by the surface treatment : it increased with increasing GNP content regardless of the surface treatment.