Study On The Preparation And The Electrically Conductive Performance Of Fiber Reinforced Polymer Composites

Crystalline selenium was synthesized by the hydrothermal method from the reaction of a GeSe4 glass with water. This simple process in aqueous solution opens new perspectives for the synthesis of 1D particles of crystallized selenium at large scale, a rapid reaction and with less pollution characteristics. By using scanning electron microscopy, transmission electron microscopy and Raman spectrum to determine the product composition and geometry topography of selenium fiber. Scanning the surface morphology by atomic force microscope can help us to observe the hexagonal phase of selenium. To measure hardness and elastic modulus of fiber by nanoindentation experiments, the results show an obvious indentation size effect.Resin-based composites have been more and more applied in the field of civil aviation,the rapid development of composite materials gave a great influence on the civil aviation.While the insulating properties of the resin matrix causes that the composite material has a poor conductive than metal material, which directly affects the electromagnetic compatibility,the conductivity of the composite material limits the expansion application on aircraft. We aim to prepare carbon fiber and selenium fiber reinforced composites. The conductivity of composites were measured through experiments, and we study the temperature-sensitive properties, the pressure-sensitive properties and photosensitivity of composite materials. The experiments' results show that the composite material exists percolation phenomena, which is in line with the conductive channel theory and tunneling current theory; As the aspect ratio increases, the percolation threshold of conductive material appears significantly reducing; It shows positive temperature effect(PTC) and negative temperature effect(NTC); When the pressure increases, the material reflects the positive pressure effect(PPC); With the light intensity increases, the composites that added selenium fiber exhibit photosensitivity. When the selenium and carbon fibers added to the resin together, the volume ratio of these two fibers also have a greater impact of the material resistivity.