Abstract Hexagonal boron nitride (h-BN), as a high thermal conductive filler, has been widely used to construct thermal transport network in polymers. However, anisotropic thermal property of BN and its conventional thermal conductive network usually lead to high thermal conductivity in one direction that limits the overall heat dissipation effect. Herein, we report a novel radially aligned three-dimensional boron nitride nanosheets/epoxy composite for thermal interface materials via radial freeze-casting method. The as-prepared composite with radially aligned boron nitride nanosheets lamellae exhibits bidirectional high thermal conductivity, with 4.02 W m−1 K−1 in the through-plane direction and 3.87 W m−1 K−1 in the in-plane direction even at low BNNS loading (e.g., 15 vol%), respectively. Besides, excellent electronic insulation property and shape stability can also meet the requirements of isotropic TIM in thermal management.

中文翻译：

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具有径向排列的氮化硼纳米片薄片的双向高导热环氧树脂复合材料

摘要 六方氮化硼（h-BN）作为一种高导热填料，已被广泛用于构建聚合物的热传输网络。然而，BN的各向异性热性能及其传统的导热网络通常会导致一个方向的高导热性，从而限制了整体散热效果。在此，我们通过径向冷冻铸造方法报告了一种用于热界面材料的新型径向排列的三维氮化硼纳米片/环氧树脂复合材料。所制备的具有径向排列的氮化硼纳米片薄片的复合材料表现出双向的高导热性，平面方向为 4.02 W m-1 K-1，面内方向为 3.87 W m-1 K-1，即使在低 BNNS 负载（例如，15 体积％），分别。除了，