导热但电绝缘的聚苯并唑纳米纤维/氮化硼纳米片用于 5G 基站和变压器散热的纳米复合纸,ACS Nano

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导热但电绝缘的聚苯并唑纳米纤维/氮化硼纳米片用于 5G 基站和变压器散热的纳米复合纸
ACS Nano ( IF 15.8 ) Pub Date : 2022-08-19 , DOI: 10.1021/acsnano.2c04534
Yu Chen ₁ , Honggang Zhang ₂ , Jie Chen ₁ , Yiting Guo ₃ , Pingkai Jiang ₁ , Feng Gao ₃ , Hua Bao ₂ , Xingyi Huang ₁

Affiliation

5G设备和高功率密度电子设备的快速发展，需要高导热材料进行散热。介电聚合物复合材料非常有前景，因为其电绝缘性、机械性能、热稳定性甚至阻燃性对于电气和电子应用也非常重要。然而，目前介电聚合物复合材料的导热性增强通常是以降低机械和电绝缘性能为代价的。在这项工作中，我们报告了高导热和电绝缘聚合物（p-亚苯基苯并双恶唑）纳米纤维（PBONF）复合材料，通过掺入低重量分数的功能化氮化硼纳米片（BNNS）。BNNSs具有强静电相互作用，被PBONFs包裹，所构建的稳健互连网络使纳米复合材料呈现出珍珠层状结构。^{因此，纳米复合纸具有 21.34 W m –1} K ^–1的高面内热导率在 10 wt% BNNSs 的低负载下，表现出 206 MPa 的超高强度。此外，纳米复合纸在高达 350 °C 以上的温度下表现出优异的电绝缘性能和优异的阻燃性。纳米复合纸的强大散热能力在5G基站和控制变压器中得到展示，在高功率密度电气设备和电子设备中显示出广泛的潜在应用。

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Thermally Conductive but Electrically Insulating Polybenzazole Nanofiber/Boron Nitride Nanosheets Nanocomposite Paper for Heat Dissipation of 5G Base Stations and Transformers

The rapid development of 5G equipment and high-power density electronic devices calls for high thermal conductivity materials for heat dissipation. Dielectric polymer composites are highly promising as the electrical insulation, mechanical property, thermal stability, and even fire retardance are also of great importance for electrical and electronic applications. However, the current thermal conductivity enhancement of dielectric polymer composites is usually at the cost of lowering the mechanical and electrical insulating properties. In this work, we report the facile preparation of highly thermally conductive and electrically insulating poly(p-phenylene benzobisoxazole) nanofiber (PBONF) composites by incorporating a low weight fraction of functionalized boron nitride nanosheets (BNNSs). With strong electrostatic interaction, the BNNSs are encapsulated by PBONFs, and the constructed robust interconnected network makes the nanocomposites exhibit a nacre-like structure. Accordingly, the nanocomposite paper has a high in-plane thermal conductivity of 21.34 W m^–1 K^–1 at a low loading of 10 wt % BNNSs and exhibits an ultrahigh strength of 206 MPa. Additionally, the nanocomposite paper exhibits superior electrical insulation properties up to higher than 350 °C and excellent fire retardance. The strong heat dissipation capability of the nanocomposite paper was demonstrated in 5G base stations and control transformers, showing wide potential applications in high power density electrical equipment and electronic devices.

更新日期：2022-08-19

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