Abstract Noteworthy improvements of functional composite materials that combine excellent thermal conductivity and superior mechanical strength have induced the rapid development of thermal management technology. However, the frustrating dispersion of fillers leads to phonon scattering, thereby hindering the thermal conduction in the polymer matrix. This study reports an urchin-structured filler that is obtained via hydrothermal synthesis and subsequent graphitic carbon coating and its application in thermally conductive composites. The obtained composites exhibit high thermal conductivity at low filler loadings (2.306 W/m·K, 5 wt%) and excellent stability of the thermal conductivity with the change of the operating temperature. The high thermal conductivity is attributed to the improved dispersibility of the urchin-structured filler according to Agari's model. This work paves a new way for the synthesis of reinforced fillers in thermally conductive composites.

中文翻译：

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均匀分散的海胆结构 Fe3O4，在聚偏二氟乙烯内具有石墨碳棘，可有效导热

摘要 兼具优异导热性和机械强度的功能复合材料的显着改进推动了热管理技术的快速发展。然而，令人沮丧的填料分散会导致声子散射，从而阻碍聚合物基体中的热传导。本研究报告了一种通过水热合成和随后的石墨碳涂层获得的海胆结构填料及其在导热复合材料中的应用。所得复合材料在低填料量（2.306 W/m·K, 5 wt%）下表现出高导热性，并且随着工作温度的变化，导热性具有优异的稳定性。根据 Agari 模型，高导热性归因于海胆结构填料的分散性提高。这项工作为合成导热复合材料中的增强填料铺平了道路。