定向鳞片石墨/PA66导热复合材料的性能

Properties of Directional Flake Graphite/PA66 Thermal Conductive Composites

采用廉价的鳞片石墨(FG)作为碳基导热材料,将FG定向排布于PA66板上,通过单向热压机,制备出高导热复合材料FG/PA66,研究了FG定向排布后复合材料的导热以及力学性能。研究表明,FG/PA66中FG定向排布形成高导热通路提高了复合材料的导热性能。当FG定向填充,含量为50%时复合材料热导率最高,高导热方向热导率为74 W/(m·K)。同时,采用硅烷偶联剂改善FG和PA66板的相容性,经过偶联剂处理之后复合材料的相比于未处理的复合材料不仅导热性能得到了提升,而且力学性能也得到了增强,含量为30%时热导率提升不明显,弯曲强度提升35%;含量为40%时热导率提升17%,弯曲强度提升34%;含量为40%时热导率提升37%,弯曲强度提升73%。

Cheap flake graphite(FG)was used as carbon based thermal conductive material.FG/polyamide(PA)66 was prepared by unidirectional hot pressing machine.The thermal conductivity and mechanical properties of the composite material after FG oriented arrangement were studied.The study shows that FG/PA66 directional arrangement of FG to form a high thermal conductivity path improves the thermal conductivity of composite materials.When FG is directional filled and the content is 50%,the composite material has the highest thermal conductivity,and the high thermal conductivity direction is 74 W/(m·K).At the same time,silane coupling agent is used to improve the compatibility of FG and PA66 plates.It is found that the thermal conductivity and mechanical properties of the composite treated with the coupling agent are improved comparing with those of the untreated composite.When the content is 30%,the thermal conductivity is not significantly improved,and the bending strength is increased by 35%.The thermal conductivity and bending strength increase by 17%and 34%,respectively,when the content is 40%.When the content is 40%,the thermal conductivity increases by 37%and the bending strength increases by 73%.