Preparation Of Unsaturated Resin/Gaphite Nanosheets Conductive Composites Induced By Electric Field

As a conductive fillers, graphite nanosheets can be induced by the AC electric field in unsaturated polyester resin and then prepared oriented unsaturated polyester resin/graphite nanosheets composite. Compared with one-dimensional structure of carbon nanofiber and carbon nanotubes, two-dimensional flake-like shape graphite nanosheets have high aspect ratio. Applying an electric field during the preparation of the composite, graphite nanosheets can be oriented conquering the shearing action of viscous in a insulating polymer matrix due to the cooperative effect of the electric torque exerted by the electric field directly on the nanosheets.In this article, we investigate the preparation,configuration and capability of the unsaturated resin/graphite nanosheets conductive composites and the oriented theory of the graphite nanosheets induced in the electric field. The measures and observation of scanning electron microscopy, X-ray diffraction and electrical conductivity, electric current have shown that the graphite nanosheets are oriented by electric field which were randomly dispersed in the polymer matrix at the beginning, and then oriented with their flakes along the electric field in the polyester resin. For the oriented of the graphite nanosheets in the polymer matrix, conductive network is formed and improves the electrical conductivity, resulting lower percolation threshold of about 0.25wt% compared with 1.65wt% that is not applying electric field. In addition, the impact of the electric field,variable-time operation,temperature et al, have been investigated which can be related to the polarization exerted by the electric field directly on the nanosheets,the degree of the orientation and the molecular movement, respectively. By the control of the electric field,variable-time operation,temperature, the unsaturated resin/graphite nanosheets conductive composites can be prepared with excellently degree of the orientation and superior electrical conductivity.