ABSTRACT Owing to the thermal management of polymer-based thermal conductive composites provide great performance in various applications, widespread attention has been focused on the design and fabrication of thermally conductive materials. In the work, ultrahigh molecular weight polyethylene (UHMWPE) / boron nitride (BN) composites with segregated structures were fabricated by a facile heat-treatment powder mixing method. SEM and optical images revealed that BN flakes can be tightly overlapped on the surface of UHMWPE particles by heat-treatment in the mixing process and the thermally conductive network was more continuous and homogeneous, leading to the greatly improved thermal conductivity. Laser flash thermal analyzer (LFA) demonstrated that an optimised in-plane thermal conductivity of UHMWPE/BN composites fabricated by the heat-treatment powder mixing method can reach to 9.99 W m−1 K−1 by adjusting the BN loading to 21.6 vol %. In summary, the UHMWPE/BN composite with high thermal conductivity provides excellent heat dissipation ability in the in-plane direction, which is very important for thermally conductive materials.

中文翻译：

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制造具有分离结构的高导热 UHMWPE/BN 复合材料的简便方法，用于热管理

摘要 由于聚合物基导热复合材料的热管理在各种应用中提供了良好的性能，因此广泛关注导热材料的设计和制造。在这项工作中，通过简便的热处理粉末混合方法制备了具有分离结构的超高分子量聚乙烯（UHMWPE）/氮化硼（BN）复合材料。SEM和光学图像表明，BN薄片可以通过混合过程中的热处理紧密重叠在UHMWPE颗粒表面，并且导热网络更加连续和均匀，从而大大提高了导热性。激光闪光热分析仪 (LFA) 表明，通过将 BN 负载量调整为 21.6 vol %，通过热处理粉末混合方法制备的 UHMWPE/BN 复合材料的优化面内热导率可以达到 9.99 W m-1 K-1 . 综上所述，具有高导热性的 UHMWPE/BN 复合材料在面内方向提供了优异的散热能力，这对于导热材料非常重要。