Research On Synthesis And Performance Of Carbon Nanotubes/graphene/epoxy Resin Composites

Carbon nanotubes (CNTs) and multilayer graphenes (MGPs) have excellent thermal, electrical and mechanical properties. They are perfect reinforcing materials for polymer composites.Epoxy resin (EP), which has strong cohesive force and good mechanical properties, becomes brittle, poor impact resistance and bad stress cracking. It is proved to be an effective way to improve the performance of epoxy resin by inducing modified nanoparticles into epoxy resin. In this paper, carbon modified nanotubes and graphene sheet were added to the epoxy resin. Then both solution and melt mixing methods were used to prepare CNTs/MGPs/EP composite materials. The modified CNTs and MGPs was characterized by Raman, FT-IR, TGA. Mechanical property, heat-conducting property and conductivity property were used to evaluate the reinforcing effect. The microstructure of composites and thermostability were characterized by SEM, TGA. And the mechanism of the MGPs reinforcement was studied. The main achievements and research contents are as follows:(1) Modified CNTs had favorable strengthen effect in the EP composites, especially modified graphene sheet, which enhanced the dispersion of CNTs in the EP and reinforced EP. With1.0wt%M-CNTs, the tensile strength of composites was increased by33.3%and the elongation at break47.1%compared to neat EP. The thermal stability of the materials and thermal conductivity were also improved. Research showed that the thermal conductivity was increased by20%.(2) MGPs and CNTs mutual mixture model was established. The mutual mixing effect of CNTs can effectively prevent its secondary agglomerate in resin matrix, which promoted homodisperse of nanofillers, thus the effect of modification. The results showed that the tensile strength of the CNTs/MGP/EP composites was increased by37.8%, the elongation at break67.6%and thermal conductivity22.3%.(3) TEM, Raman, FT-IR and TGA characterized that carboxy, hydroxy were grafted into the surface successfully by chemical modification of CNTs, which effectively dispersed fillers and improved the cohesion.