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Improved dielectric stability of epoxy composites with ultralow boron nitride loading

机译：利用超级硼氮化物负载改善环氧复合材料的介电稳定性

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摘要

Polymer-based composites have attracted increasing interest and been widely used in the field of electronic devices, but they are limited due to their low working temperature and dielectric instability. To date, there are few reports on improving the dielectric stability of polymer-based composites. Herein, three-dimensional boron nitride/nylon 66 (3D BN/PA66) aerogels are facilely prepared for the first time by freeze-drying without templates. The BN/PA66 composites are prepared by infiltrating 3D BN/PA66 aerogels with the epoxy. The thermal conductivity of the 3D BN/PA66 composite increases to 0.6 W m(-1) K-1 due to the formation of a BN microplatelet thermal conduction network at an ultralow BN loading of 4 vol%, which is about 5-fold and 3-fold higher than that of neat epoxy and random BN/EP composite with the same BN loading. Meanwhile, the dielectric constant variation of the BN/PA66 composites is only 6%, showing much better stability in the dielectric properties than neat epoxy and random BN/EP composites over the temperature range 25-200 degrees C. Our research provides a new strategy to prepare the 3D BN aerogels and proves that the 3D BN/PA66 aerogel is a potential platform for preparing polymer-based composites with excellent dielectric stability.
机译：基于聚合物的复合材料已经吸引了越来越兴趣并被广泛用于电子设备领域，但由于其低的工作温度和介电不稳定性，它们受到限制。迄今为止，很少有关于提高聚合物基复合材料的介电稳定性的报道。在此，通过没有模板的冷冻干燥，首次制备三维氮化硼/尼龙66（3D BN / PA66）气凝胶。通过用环氧树脂渗透3D BN / PA66气凝胶来制备BN / PA66复合材料。所述3D BN的热导率/ PA66复合增大到为0.6W米（-1）K-1由于BN的生成在超低负荷的BN 4％（体积），这大约是微片的热传导网络5倍和3倍高于纯环氧和随机BN / EP复合材料，具有相同的BN负载。同时，BN / PA66复合材料的介电常数变化仅为6％，在温度范围内的晶体性质和随机BN / EP复合材料中显示出的介电性能更好。我们的研究提供了一种新的策略准备3D BN气凝胶并证明3D BN / PA66气凝胶是用于制备具有优异介电稳定性的聚合物基复合材料的潜在平台。

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  • 来源
    《RSC Advances》 |2019年第8期|共7页
  • 作者

    Fu Xiuwu; Guo Yiping; Du Qi; Guan Lin; He Sibo;

  • 作者单位

    Shanghai Jiao Tong Univ Sch Mat Sci &

    Engn State Key Lab Met Matrix Composites Shanghai 200240 Peoples R China;

    Shanghai Jiao Tong Univ Sch Mat Sci &

    Engn State Key Lab Met Matrix Composites Shanghai 200240 Peoples R China;

    Shanghai Jiao Tong Univ Sch Mat Sci &

    Engn State Key Lab Met Matrix Composites Shanghai 200240 Peoples R China;

    Shanghai Jiao Tong Univ Sch Mat Sci &

    Engn State Key Lab Met Matrix Composites Shanghai 200240 Peoples R China;

    Shanghai Jiao Tong Univ Sch Mat Sci &

    Engn State Key Lab Met Matrix Composites Shanghai 200240 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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