| With the development of today’s society,compared with the integration of electronic equipment,high power requirements are becoming higher and higher,and the corresponding requirements for heat transfer are becoming higher and higher.If the equipment runs at high temperature,the operation efficiency will decrease,which means that timely heat dissipation is particularly important,and traditional metal materials can’t meet the current heat dissipation requirements,such as strong acid and alkali industrial environment.The polymer material has the characteristics of easy performance and corrosion resistance,so we can improve the thermal conductivity of the composite by adding filler material to the polymer material.In this paper,high density polyethylene(HDPE)is used as the matrix material,and HDPE was filled and modified with new carbon materials such as carbon nanotubes(CNT),graphene oxide(GO),and amine-functionalized graphene oxide(NGO),and the properties of the composites were studied..First,CNT/HDPE composites were prepared by melting blending method.The thermal conductivity and mechanical properties of CNT/HDPE composites were studied.It is found that the thermal conductivity of the composites is improved while the mechanical properties are decreased.When CNT filling amount is 9wt% at 25℃,the thermal conductivity of the composites increases by 17%.Then CNT/HDPE,GO/HDPE,NGO/HDPE,NGO+CNT/HDPE composites were prepared by melt blending and solution blending,and their thermal conductivity and mechanical properties were studied.It is found that under the condition of the same doping ratio,the properties of the four composites are gradually enhanced in order.At 25℃,when the matrix filling amount is 9wt%,the thermal conductivity of the four composites increases by 17%,50.3%,78.8% and 156.4% respectively under the melting blending condition.The thermal conductivity of the four composites increased by 22.4%,69.7%,109.7% and 165%,respectively.Meanwhile,the mechanical properties of NGO/HDPE and NGO+CNT/HDPE composites are much better than those of GO/HDPE and CNT/HDPE composites.This article also discusses the temperature influence on heat conduction performance,and mixed way found that temperature has a negative influence on heat conduction performance is,this is mainly due to the high temperature composite packing of particles can produce severe vibration,the violent vibration will weaken the phonon movement in the composites,which reduces the coefficient of thermal conductivity of materials;In terms of performance,solution blending is better than melt blending,but the cost of solution blending is higher,so melt blending is often used in industry. |
