纳米复合材料界面维度及组成对热量输运影响的研究

界面是影响复合材料热导率的重要因素，纳米尺度时由于界面热阻的等效厚度与纳米材料的尺寸相当，因而界面的影响更加显著。本项目以聚合物纳米复合材料中的界面为研究对象，通过引入界面维度、界面组成等描述界面特征的参数来划分界面类别并描绘微观界面的物理图形。针对不同类别的界面，采用实验测量为主、理论分析和模拟计算为辅的方法深入研究界面的热量输运特性。将表面修饰等界面调控引起的效果划归为界面维度和界面组成的变化，经由界面热阻与界面维度、界面组成之间的关联，获得界面调控的评价和指引。在计算纳米复合材料整体热导率的单胞模型中，加入界面热阻的影响，建立微观界面导热性能与材料宏观热导率之间的联系。通过这些研究工作，加深对于复合材料导热性能的理解，尤其是获得对于纳米复合材料微观界面热量输运的科学认识，进而可以为纳米复合材料的制备和性能调控提供理论依据和方法指引。

Interface is one of the key factors influencing the thermal conductivity of composite materials. The role of the interfaces becomes increasingly significant in nanoscale, since the interfacial thermal resistance approaches a magnitude similar to that of the nano-material itself. This research proposal aims to study the interface in the polymer nanocomposites. The complex interfaces are classified into several categories by employing interface dimension and interface composition, and the corresponding simplified geometric figures are drawn. For each category of interface, its effect on heat transport in the nanocomposite is studied by experimental test, theoretical calculation and computer simulation. The impact of interface tuning is correlated with the change of interface dimension and interface composition. Therefore it can be evaluated via the functional relation between interface thermal resistance and those of interface dimension and interface composition. The obtained result of interface thermal resistance is included in a previously developed unit cell model, which is used for calculating the thermal conductivity of polymer composite, to reflect the influence of micro interface on macro material thermal conductivity. The research work in this proposal can deepen the understanding of thermal conductivity of polymer composites and shed some light on the transport phenomenon at nanoscale, which provides guidance on preparing polymer nanocomposites and adjusting their performance.