Zheng Xiaolei, Wen Bianying
Department of Material Science and Engineering, Beijing Technology and Business University Beijing 100048 P.R. China
RSC Adv. 2019 Nov 7;9(62):36316-36323. doi: 10.1039/c9ra07168g. eCollection 2019 Nov 4.
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 K and 1.06 W m K, 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.
目前，大多数高导热性聚合物基复合材料在能够直接用于工业生产之前，都面临着一些必须解决的问题。在此，通过传统的熔融共混技术制备了一种具有相对低填料含量的实用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相中选择性分布和取向的GNPs赋予了该复合材料较低的渗滤阈值和各向异性的热导率。对填料含量对最终综合性能影响的研究表明，制备的含有20体积% GNPs的PBT/PC/GNP复合材料在热导率、耐热性和机械性能方面表现出优异的性能。该复合材料的面内热导率和垂直面热导率分别为5.82 W m⁻¹ K⁻¹ 和1.06 W m⁻¹ K⁻¹，与纯PBT/PC共混物相比分别提高了2430%和361%。维卡软化温度提高了17.7℃，达到213.7℃，同时机械性能也保持在良好的应用水平。
