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摘要随着大功率电气、电子产品、汽车等领域的快速发展，散热问题是限制以上领域发展的原因之一。聚合物导热材料主要分为两种：一是具有高导热率的结构聚合物，如聚乙炔、聚苯胺、聚吡咯，或具有完整结晶结构的聚合物；二是填充型导热复合聚合物，如将 氮化硼、碳纤维、碳纳米管、石墨等高导热材料填充环氧树脂制备导热复合材料。聚合物本身的热导率非常低,通过添加具有高导热性的填料,聚合物的热导率可以提高。但由于填料与基体之间界面热阻的存在,特别是对于添加纳米级填料的复合材料,复合材料的导热性能并不理想。因此,界面结构的改善对于提高纳米复合材料的导热性能来说非常关键。石墨烯具有优异的导热性能,同时也具有可观的导电率。本论文利用二氧化硅层包覆在石墨烯表面,大幅度降低电导率,并增加石墨烯与聚合物基体界面之间的相容性,促进热量在界面上的传递。由此得到的兼具优异的导热性能和电绝缘性的纳米复合材料是开发多功能集成结构电子系统的关键材料,以被应用于热控制和电子封装等领域。48083
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毕业论文关键词 石墨烯；复合材料；导热；绝缘；
Title The study of the Thermal conductive composites of Graphene
Abstract With the rapid development of power electrical , electronic products, automotive and other fields, heat dissipation is one of the reasons for the limit of the above areas. Thermally conductive polymer materials are mainly pided into two types: on one hand, structural polymer with high thermal conductivity, such as poly acetylene, polyaniline, or a polymer with a complete crystalline structure; On the other hand , Thermal conductive composites filled with high thermal conductivity materials such as BN, carbon fiber, carbon nanotubes and graphite. The thermal conductivity of the polymer itself is very low, and the thermal conductivity of the polymer can be improved by adding fillers with high thermal conductivity. However, due to the existence of the interface thermal resistance between the filler and the matrix, especially for the composite materials with nanometer filler, the thermal conductivity of the composites is not ideal. Therefore, improving the interface structure is particularly important for improving the thermal conductivity of the nanocomposites. Graphene has excellent thermal conductivity, but it also has a high electrical conductivity. In this paper, the electric insulation layer is used to coat the surface of graphene, while reducing the conductivity of graphene sheets, it can also improve the compatibility between the interface of graphene and polymer matrix, and promote the transfer of interfacial heat. The composite nanomaterial with excellent thermal conductivity and electrical insulating property is a key material for the development of multifunction integrated electronic system, which is used in the fields of thermal control and electronic packaging.
Keywords : Composite materials; Graphene; Thermal conductivity; Insulation;
目次
1.引言...1
1.1石墨烯介绍.1
1.1.1石墨烯的特点....1
1.1.2石墨烯的应用....2
1.1.3石墨烯的缺点....2
1.2填充型导热复合材料2
1.2.1金属粉末填充物...2
1.2.2氮化物填料.3
1.2.3碳纤维填料.3
1.3石墨烯填料的导热复合材料4
1.3.1电学性能.4
1.3.2热学性能.4
1.3.3力学性能..5
1.4.1石墨烯复合材料的应用.5
1.4.2导热石墨烯材料的研究.5
1.5课题研究内容和意义6
1.5.1研究内容.6
1.5.2研究意义.6
2石墨烯的包覆实验....6
2.1实验材料...6