The high interfacial thermal resistance, poor dispersion, and insufficient contact of the fillers in polymer-based composites result in a lower thermal conductivity, restricting the development of heat conduction and dissipation industrial application. In this paper, bioinspired modification of poly(dopamine) (PDA) was applied to improve the interfacial adhesion performance of copper nanospheres (Cu) and carbon nanotubes (CNTs) in a poly(vinylidene fluoride) (PVDF) matrix. The synergistic effect of Cu and CNTs with different dimensions was beneficial to the formation of a continuous heat conduction network. Moreover, CNTs could reduce the distance that linked the adjacent Cu with the PVDF matrix and fill the defect vacancies. The PVDF composite with 30 wt % Cu and 5 wt % CNT achieved a high thermal conductivity of 1.44 W/(m·K) and a tensile strength of 95 MPa. The simulation analysis of the model indicated that the interconnected architecture of the CNT/Cu/PVDF/PDA composite reduced the interfacial thermal resistance by the bridging effect of CNTs. The long-term heat-transfer test with the corrosive medium showed that a high-performance polymer heat exchanger will have great application potential in the field of waste heat recovering.

中文翻译：

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增强界面相互作用以制造具有高导热率的热交换器用聚偏二氟乙烯复合材料

高的界面热阻，差的分散性以及填料在聚合物基复合材料中的不充分接触导致较低的导热率，从而限制了导热和散热工业应用的发展。在本文中，对聚多巴胺（PDA）进行了生物启发改性，以改善聚偏二氟乙烯（PVDF）基质中铜纳米球（Cu）和碳纳米管（CNT）的界面粘合性能。不同尺寸的铜和碳纳米管的协同作用有利于形成连续的导热网络。此外，碳纳米管可以缩短将相邻的铜与PVDF基质连接的距离，并填补缺陷空位。具有30 wt％的Cu和5 wt％的CNT的PVDF复合材料实现了1。44 W /（m·K）和抗拉强度为95 MPa。对模型的仿真分析表明，碳纳米管/铜/ PVDF / PDA复合材料的互连结构通过碳纳米管的桥连效应降低了界面热阻。腐蚀性介质的长期传热试验表明，高性能的聚合物热交换器在废热回收领域具有巨大的应用潜力。