High thermal conductivity polymer materials are highly desirable for thermal management applications in electrical encapsulation and energy fields. The construction of three-dimensional thermal conductivity structure has become an attractive method to improve the thermal conductivity of polymers. However, traditional methods for constructing 3D structures use prefabricated thermal conductivity models. Herein, we take epoxy resin as matrix, through the cooperation of sheet BN and spherical Al₂O₃ to in situ construct a “pea-pod-like” 3D thermal network, to prepare high thermal conductivity Al₂O₃-BN-Epoxy (ABE) composites. Compared with pure epoxy resin, the thermal conductivity of the ABE composites and the random Al₂O₃-BN-Epoxy (R-ABE) composite is increased by 257% and 63%, respectively. And it still has a high thermal conductivity at low temperatures (696% enhancement at 60 K) for ABE_60% composite. This method of in situ construction of 3D thermal conductivity networks is of great significance in the development and application of thermal management materials.

中文翻译：

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原位构建“豌豆荚状”氧化铝-氮化硼3D结构的高导热环氧树脂复合材料

高导热性聚合物材料对于电气封装和能源领域的热管理应用非常理想。构建三维导热结构已成为提高聚合物导热性的一种有吸引力的方法。然而，构建 3D 结构的传统方法使用预制的热导率模型。在此，我们以环氧树脂为基体，通过片状BN和球形Al ₂ O ₃的配合，原位构建“豌豆荚状”3D热网络，制备高导热Al ₂ O ₃ -BN-Epoxy (ABE) 复合材料。与纯环氧树脂相比，ABE复合材料的热导率和无规Al ₂O ₃ -BN-Epoxy (R-ABE) 复合材料分别提高了 257% 和 63%。_{对于 ABE 60%}复合材料，它在低温下仍具有高导热性（60 K 时提高 696%） 。这种原位构建3D导热网络的方法对于热管理材料的开发和应用具有重要意义。