Jiangsu Co-Innovation Center for Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing, China.
PLoS One. 2018 Jul 19;13(7):e0200842. doi: 10.1371/journal.pone.0200842. eCollection 2018.
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 4.72×10(14) Ω•m, respectively. The resultant insulating material which has better heat conduction property may have a vast potential for future development in electrical equipment.
随着电气设备向高功率输出的不断发展，对内部绝缘结构的散热性能提出了更高的要求。这对传统的纸基绝缘材料提出了挑战，因为其导热性能较差。将导热且电绝缘的填充剂引入纤维素基绝缘材料中可以提高其导热性能。本工作提供了一种制备导热且电绝缘 BN/纤维素纤维复合材料的方法。通过接枝 APTES 和添加双尺寸填料，显著提高了复合材料的热导率。复合材料的热导率达到 0.682 W/（m•k），在 h-BN 负载为 41.08wt%时，热导率提高了 387%。同时，BN 填料提高了所得复合材料的绝缘性能。复合材料的介电常数、击穿强度和体积电阻率分别达到 4.75、9.2kV/mm-1 和 4.72×10(14) Ω•m。这种具有更好导热性能的绝缘材料可能在未来电气设备的发展中具有广阔的应用前景。
