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Practical PBT/PC/GNP composites with anisotropic thermal conductivity

机译：实用的具有各向异性导热性的PBT / PC / GNP复合材料

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摘要

Most of the highly thermally conductive polymer-based composites currently face problems that must be solved before they can be directly used in industrial production. Herein, a practical polybutylene terephthalate (PBT)/polycarbonate (PC)/graphite nanoplatelet (GNP) thermally conductive composite with relative low filler content was prepared by a conventional melt-blending technique. GNPs selectively distributed and oriented in the PBT phase afford the composite a low percolation threshold and anisotropic thermal conductivity. Investigation of the influence of filler content on the final comprehensive performance showed that a prepared PBT/PC/GNP composite with 20 vol% GNPs exhibited superior performance in thermal conductivity, heat resistance, and mechanical properties. The in-plane and through-plane thermal conductivities of the composite were 5.82 W m ~(?1) K ~(?1) and 1.06 W m ~(?1) K ~(?1) , respectively, which were increased by 2430% and 361% as compared to that of a neat PBT/PC blend. The Vicat softening temperature increased by 17.7 °C and reached 213.7 °C, while the mechanical properties also maintained a good application level.
机译：当前，大多数高导热聚合物基复合材料都面临着必须解决的问题，然后才能将其直接用于工业生产。本文中，通过常规的熔融共混技术制备了填充剂含量相对较低的实用的聚对苯二甲酸丁二醇酯（PBT）/聚碳酸酯（PC）/石墨纳米片（GNP）导热复合材料。在PBT相中选择性分布和定向的GNP为复合材料提供了低渗透阈值和各向异性导热系数。填料含量对最终综合性能的影响研究表明，所制备的具有20％（体积）GNP的PBT / PC / GNP复合材料在导热性，耐热性和机械性能方面均表现出优异的性能。该复合材料的平面内和平面内热导率分别为5.82 W m〜（？1）K〜（？1）和1.06 W m〜（？1）K〜（？1），并分别增加与纯PBT / PC混合物相比，分别为2430％和361％。维卡软化温度提高了17.7°C，达到213.7°C，同时机械性能也保持了良好的应用水平。

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