The continuous development of high electrical equipment towards high power output requires better heat dissipation performance of internal insulation structure. It challenges the traditional paper-based insulating materials, with poor thermal conductivity. Introducing thermally conductive and electrically insulating filler into cellulose-based insulating material can enhance heat conduction performance. This work provided a method to prepare thermally conductive and electrically insulating BN/cellulosic fibre composites. And the thermal conductivity of the composites was remarkably increased via grafting APTES and adding dual-sized fillers. The thermal conductivity of the composite reached 0.682 W/(m•k) that increased by 387% with h-BN loading of 41.08 wt%. Simultaneously, BN fillers improved the insulating properties of the resultant composites. The dielectric constant, breaking strength of and volume resistivity of the composites reached 4.75, 9.2 kV/mm-1 and 4.72×1014 Ω•m, respectively. The resultant insulating material which has better heat conduction property may have a vast potential for future development in electrical equipment.
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机译：高电气设备向高功率输出的持续发展要求内部绝缘结构具有更好的散热性能。它挑战了导热性差的传统纸基绝缘材料。将导热和电绝缘的填料引入到纤维素基绝缘材料中可以增强导热性能。这项工作提供了一种制备导热和电绝缘的BN /纤维素纤维复合材料的方法。通过接枝APTES和添加双重尺寸的填料，复合材料的热导率显着提高。复合材料的热导率达到0.682 W /（m•k），在h-BN负载为41.08 wt％的情况下增加了387％。同时，BN填料改善了所得复合材料的绝缘性能。复合材料的介电常数，断裂强度和体积电阻率分别达到4.75、9.2 kV / mm -1 和4.72×10 14 Ω•m。所得的具有更好导热性能的绝缘材料对于电气设备的未来发展可能具有巨大的潜力。
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