Preparation And Study Of Graphene/Carbon Nanotubes/epoxy Resin Composite

The increasing use of electronic equipment, making the magnetic wave pollution also becomes more and more serious, so the use of shielding materials is to reduce the harm.Conductive high polymer have excellent performance, such as lighter, corrosion resistance,plasticity, easy processing and low price, widely used in high-performance electromagnetic shielding materials. The composite properties of the conductive polymer and the matrix are the hotspots of the present research, but the shielding performance of the composites depends mainly on the intrinsic conductivity and its dispersion in the polymer matrix. In order to improve the dispersion properties of composites, carbon nanotubes (CNT) and / or graphene (GNS) / epoxy composites were prepared and their properties were studied. The main contents are as follows:First, carbon nanotubes (CNT) / Epoxy Resin (EP) composites were prepared by solution casting and vacuum molding using acetone as solvent. The results of scanning electron microscopy(SEM) show that the conductivity has improved not significant with the increase of filler content,the residual rate reached 13.13%, the electromagnetic shielding efficiency was 18dB when the filler content is 5wt%. Second, changed the type of filler, preparation the GNS / EP composite materials,The SEM images clearly show that GNS is uniformly dispersed in the resin matrix, when the filler content is 5wt%, the conductivity reached 0.97×10-1S/m, The highest EMI values reached 26dB, which has been applied to business. Finally, changed the type and quantity of filler, CNT and GNS that were ultrasonic dispersed respectively was added to the EP resin matrix, the GNS/CNT/EP composites were prepared, Using the synergistic effect of CNT and GNS, the results Show that the thermal stability was significantly improved. Although different degrees of reunion appeared with the increase in the content of filler, the performance all have improved compare with pure EP and CNT/EP composites, the electromagnetic shielding efficiency was 22dB at 5wt%.