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首页> 外文期刊>Journal of Applied Polymer Science >Thermal conductivity improvement in electrically insulating silicone rubber composites by the construction of hybrid three-dimensional filler networks with boron nitride and carbon nanotubes
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Thermal conductivity improvement in electrically insulating silicone rubber composites by the construction of hybrid three-dimensional filler networks with boron nitride and carbon nanotubes

机译：通过氮化硼和碳纳米管的杂合三维填充网构造电绝缘硅橡胶复合材料的热导电性改善

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摘要

In this study, we constructed hybrid three-dimensional (3D) filler networks by simply incorporating a relatively low content of one-dimensional carbon nanotubes (CNTs; 0.0005-0.25 vol %) and a certain content of two-dimensional boron nitride (BN; 30 phr) in a silicone rubber (SIR) matrix. As indicated by transmission electron microscopy observation, flexible CNTs can serve as bridges to connect BN platelets in different layers to form hybrid 3D thermally conductive networks; this results in an increase in thermally conductive pathways, and the isolation between CNTs can prevent the formation of electrically conductive networks. Compared to the SIR-BN composite with the same BN content, the SIR-BN-CNT composites exhibited improved thermal conductivity, slightly increased volume resistivity, and comparable breakdown strength without a largely decreased flexibility. When 0.25 vol % CNTs were incorporated, the SIR-BN-CNT composite exhibited 75 and 25% higher thermal conductivities relative to the neat SIR and SIR-BN composite with 30 phr BN, respectively, and a thermal conductivity that was even comparable to SIR-BN composite with 40 phr BN. (c) 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 46929.
机译：在该研究中，通过简单地掺入一维碳纳米管（CNT; 0.0005-0.25体积％）和一定含量的二维硼氮化物（BN; 1份）构建杂化三维（3D）填充网络。 30phr）在硅橡胶（SIR）基质中。如透射电子显微镜观察所示，柔性CNT可以用作连接在不同层中的BN血小板以形成混合3D导热网络的桥梁;这导致导热途径的增加，并且CNT之间的隔离可以防止形成导电网络。与具有相同BN含量的SIR-BN复合材料相比，SIR-BN-CNT复合材料表现出改善的导热率，略微增加的体积电阻率和可比的击穿强度，而没有大部分降低的柔韧性。当掺入0.25Vol％CNT时，SiR-BN-CNT复合材料分别显示出具有30phr Bn的纯SIR和SIR-BN复合材料的75和25％的热导率，以及甚至与先生相当的导热率-bn复合材料，40phr。 （c）2018 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2019,136,46929。

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