Abstract High strength and good thermal dissipation become the inevitable requirements for the next generation of insulation materials. Here, we report a facile method to prepare composite insulating papers by incorporating two-dimensional layered boron nitride nanosheets (BNNSs) into aramid nanofibers and aramid pulp. Their layer-by-layer structure fabricated by a vacuum-assisted filtration of their mixture suspension is similar to “brick – mortar” arrangement, contributing to the enhanced mechanical properties due to their strong interaction. Meanwhile, BNNSs act as heat-conducting “bridges”, which provide the phonon conduction channels and reduce the interface thermal contact resistance. The thermal conductivity of the composite paper with 20% loading of BNNS reaches 4.34 W m-1 K-1 and the dielectric strength is up to 59.6 kV mm-1; whereas, the values of the parallel sample without BNNS are only 0.98 W m-1 K-1 and 25.1 kV mm-1, respectively. The composite papers possess highly thermal conductivities, outstanding electrical insulation and thermal stabilities, and excellent mechanical strength and flexibility, showing great potential applications in the field of flexible electronics.

中文翻译：

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高强度高导热芳纶复合绝缘纸的表面加工

摘要 高强度和良好的散热性能成为下一代绝缘材料的必然要求。在这里，我们报告了一种通过将二维层状氮化硼纳米片（BNNS）掺入芳纶纳米纤维和芳纶纸浆中来制备复合绝缘纸的简便方法。它们的混合物悬浮液通过真空辅助过滤制成的逐层结构类似于“砖 - 砂浆”排列，由于它们的强相互作用而有助于增强机械性能。同时，BNNSs充当导热“桥梁”，提供声子传导通道并降低界面热接触电阻。BNNS负载量为20%的复合纸热导率达到4.34 W m-1 K-1，介电强度高达59.6 kV mm-1；然而，没有 BNNS 的平行样品的值分别仅为 0.98 W m-1 K-1 和 25.1 kV mm-1。该复合纸具有高导热性、优异的电绝缘性和热稳定性，以及优异的机械强度和柔韧性，在柔性电子领域显示出巨大的应用潜力。