溶液沉淀法制备高导热氮化硼/多层石墨烯/聚丙烯酸柔性自修复材料

Preparation of High Thermal Conductivity BN/MG/PAA Flexible.Self-repairing Materials by Solution Precipitation Method

以氮化硼(BN)和多层石墨烯(MG)为复合填料,通过溶液沉淀法,制备了聚丙烯酸基复合高导热界面材料。研究了填料含量和配比对复合材料导热性能的影响,实验发现随着BN和MG含量的增加导热性能先升高后降低,导热系数在BN∶MG=1∶0.3时最大(6.0 W·m-1·K-1)。通过扫描电镜(SEM)分析复合材料的微观形貌,结果显示在BN∶MG=1∶0.3时,复合填料之间的协同作用发挥的最好,形成了致密的导热网络,因而有效的提高了复合材料的导热性能。该材料除了具有较高的导热性能外,还具有一定的柔性、可塑性和自修复性能,在一定条件下能够对热界面材料的内部损伤进行修复,从而大大延长热界面材料的使用寿命。这对于维持热界面材料的正常使用,确保设备内部热量的有效传出具有重要的意义。

In order to meet the heat dissipation demand of increasing highly integrated components,the polyacrylic acid(PAA)based thermal interface material with high thermal conductivity was prepared by solution precipitation method using boron nitride(BN)and multi-layer graphene(MG)as composite thermal conductive fillers.The effects of content and proportion of the thermal conductive fillers on the thermal conductivity of the composite were studied.It is found that with the increasing of the content of BN and MG,the thermal conductivity first rises and then degrades.When BN∶MG=1∶0.3,the thermal conductivity reaches a maximum of 6.0 W·m-1·K-1.The micromorphology of the PAA composite was observed through the scanning electron microscopy(SEM).The results showed that BN and MG play aperfect synergistic effect when BN∶MG=1∶0.3 to promote the formation of a more compact thermal conductive networks,then contributing to the improvement of thermal conductivity.Besides the high thermal conductivity,the PAA composite is malleable,fabricable and self-healable.It could repair the internal damage of the thermal interface material under certain conditions,thus greatly prolonging the service life of the thermal interface material.This is a great significance for maintaining the normal use of thermal interface materials and ensuring the heat removal.