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Open AccessArticle

Anisotropic Thermally Conductive Perfluoroalkoxy Composite with Low Dielectric Constant Fabricated by Aligning Boron Nitride Nanosheets via Hot Pressing

1
School of Energy and Environmental Engineering, University of Science and Technology, Beijing 100083, China
2
Beijing Engineering Research Center of Energy Saving and Environmental Protection, University of Science and Technology, Beijing 100083, China
3
Beijing Key Laboratory for Energy Saving and Emission Reduction of Metallurgical Industry, University of Science and Technology, Beijing 100083, China
4
China Energy Conservation and Environmental Protection Group, Beijing 100082, China
5
China Energy Conservation and Environmental Protection Group, National Machinery United Electric Power (Ningxia) Co., Ltd., Yinchuan 750011, China
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Polymers 2019, 11(10), 1638; https://doi.org/10.3390/polym11101638
Received: 31 August 2019 / Revised: 28 September 2019 / Accepted: 29 September 2019 / Published: 10 October 2019
Thermal management has become a critical challenge in electronics and portable devices. To address this issue, polymer composites with high thermal conductivity (TC) and low dielectric property are urgently needed. In this work, we fabricated perfluoroalkoxy (PFA) composite with high anisotropic TC and low dielectric constant by aligning boron nitride nanosheets (BNNs) via hot pressing. We characterized the thermal stability, microstructure, in-plane and through-plane TCs, heat dissipation capability, and dielectric property of the composites. The results indicate that the BNNs–PFA composites possessed good thermal stability. When the BNNs content was higher than 10 wt %, the BNNs were well layer aligned in the PFA matrix, and the composites showed obvious anisotropic TC. The in-plane TC and through-plane TCs of 30 wt % BNNs–PFA composite were 4.65 and 1.94 W m−1 K−1, respectively. By using the composite in thermal management of high-power LED, we found that alignment of BNNs in composite significantly improves the heat dissipation capability of composite. In addition, the composites exhibited a low dielectric property. This study shows that hot pressing is a facile and low-cost method to fabricate bulk composite with anisotropic TC, which has wide applications in electronic packaging. View Full-Text
Keywords: composite; thermal conductivity; dielectric property; boron nitride nanosheets; alignment; hot pressing composite; thermal conductivity; dielectric property; boron nitride nanosheets; alignment; hot pressing
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MDPI and ACS Style

Zhang, X.; Cai, X.; Xie, X.; Pu, C.; Dong, X.; Jiang, Z.; Gao, T.; Ren, Y.; Hu, J.; Zhang, X. Anisotropic Thermally Conductive Perfluoroalkoxy Composite with Low Dielectric Constant Fabricated by Aligning Boron Nitride Nanosheets via Hot Pressing. Polymers 2019, 11, 1638.

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