石墨烯基高导热复合材料的制备及其导热机理研究

项目名称： 石墨烯基高导热复合材料的制备及其导热机理研究

项目编号： No.51206053

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 工程热物理与能源利用学科

项目作者： 裴丽霞

作者单位： 华南理工大学

项目金额： 25万元

中文摘要： 石墨烯因具有超强的导热性能和优异的力学性能而成为制备高导热复合材料的理想填料。但目前石墨烯基复合材料的导热机理不明，导热性能提高缺乏方向。针对石墨烯基复合材料的多层次、多尺度特点，本项目通过分子动力学刻画石墨烯的结构和界面特性，用耗散动力学模拟石墨烯在基体塑料中的分散形态，将分子动力学和耗散动力学获得的微介观信息映射到有限元的宏观导热性能计算中，建立一种可以反映石墨烯基复合材料微观-介观-宏观特性的多尺度导热模型，实现石墨烯基复合材料导热性能的准确预测。通过研究导热机理，提出石墨烯强化传热的方向和措施，进而制备出高导热石墨烯基复合材料。研究工作也将为纳米复合材料导热性能的准确预测提供一种有效的方法，进一步丰富导热模型的建立理论，具有重要的科学研究价值和实际工业意义。

中文关键词： 石墨烯；导热；多尺度模拟；复合材料；

英文摘要： Graphene is a type of ideal filler for the preparation of highly thermal conductive composites because of its ultrahigh thermal conductivity and good mechanic property. Currently, thermal conductive mechanism of graphene-based composites is unknown, thus enhancement of thermal conductivity is at a loss due to the lack of theoretical direction. In view of the multiscale characteristics of graphene-based composites, a thermal conductive model involving molecular dynamics, dissipative particle dynamics and finite element method is established, which can reflect the properties of composites at the level of microscale, mesoscale, and macroscale. In the model, structure of graphene and interface characteristics between graphene and polymer matrix are simulated by molecular dynamics, and dispersion of graphene in polymer is simulated by dissipative particle dynamics, and then the micro- and meso-scale information is introduced into the finite element model to simulate the thermal conductive of the composites. On the basis of this model, the thermal conductive property of composites can be predicted accurately, and the thermal conductive mechanism can also be disclosed. Under the direction of the mechanism, highly thermal conductive composites are further prepared. This project will provide an effective method to predic

英文关键词： graphene；thermal conductivity；multiscale model；composite；