A physics-based nested hierarchical approach is established to investigate thermal conducting behavior of micro-filler (in the form of particle, short and long fiber)/nanoparticle-reinforced polymer hybrid nanocomposites. An effort is made to develop a unit cell-based micromechanical model predicting the thermal conductivities of general composite systems, including microscale filler-reinforced composites, nanoparticle-reinforced nanocomposites and microscale filler/nanoparticle-reinforced hybrid nanocomposites. The role of the nanoparticle/polymer interfacial thermal resistance is also considered in the analysis. The developed model presents a reasonable behavior compared with available experiments and other modeling methods for the thermal properties of composites and nanocomposites. The results are provided for two types of hybrid nanocomposites, including carbon micro-filler/silica (SiO₂) nanoparticle-reinforced epoxy and glass micro-filler/SiO₂ nanoparticle-reinforced epoxy systems. It is found that transverse thermal conducting behavior of general fibrous composites is significantly affected by adding the nanoparticles. However, due to the dominated role of the carbon fiber in the longitudinal direction, the longitudinal thermal conductivity of carbon fiber-reinforced composites is not influenced by the nanoparticles. Also, the thermal conductivities of both randomly oriented short fiber-reinforced composite and particulate composite systems can be improved with the addition of the nanoparticles. The obtained results could be useful to guide the design of hybrid nanocomposites with optimal thermal conductivities.

建立了基于物理的嵌套分层方法，以研究微填料（以颗粒，短纤维和长纤维的形式）/纳米颗粒增强的聚合物杂化纳米复合材料的导热行为。努力开发基于单位单元的微力学模型，以预测一般复合材料系统的热导率，包括微型填料增强的复合材料，纳米颗粒增强的纳米复合材料和微型填料/纳米颗粒增强的杂化纳米复合材料。分析中还考虑了纳米颗粒/聚合物界面热阻的作用。与可用的实验和其他建模方法相比，所开发的模型对于复合材料和纳米复合材料的热性能表现出合理的行为。₂）纳米颗粒增强的环氧树脂和玻璃微填料/ SiO ₂纳米颗粒增强的环氧树脂体系。发现添加纳米颗粒显着影响了普通纤维复合材料的横向导热行为。然而，由于碳纤维在纵向上的主导作用，碳纤维增强复合材料的纵向导热率不受纳米颗粒的影响。而且，通过添加纳米颗粒，可以改善随机取向的短纤维增强复合材料和颗粒复合材料系统的热导率。获得的结果可用于指导具有最佳导热率的杂化纳米复合材料的设计。