石墨改性PA46导热复合材料的性能

Properties of Thermally Conductive Nylon 4,6 Filled with Graphite

对聚酰胺基导热材料进行了研究。采用石墨对聚己二酰丁二胺(PA46)进行填充改性,通过熔融共混及注射成型工艺制备导热复合材料。研究表明:随着石墨填充量的增加,复合材料的导热率显著增加,拉伸强度、冲击强度稍有降低。SEM形貌分析表明:随着石墨含量的增加,石墨在基体中更易形成导热链、导热网络等通路。当石墨的质量分数为50%时,导热率达到了3.743 W·m-1·K-1,是纯基体的13.91倍;热扩散系数为2.344 mm2/s,为纯基体的15.95倍。实验值与3种导热模型对比的结果表明:与Y Agari导热模型匹配的比较好,适用于低填充量的情况。

The polyamide-based thermal conductive composite was studied. Nylon 4, 6 filled with graphite composite was prepared by the method of melt blending and injection molding to improve its thermal conductivity. With the graphite filler increased, the thermal conductivity increased, however, the tensile strength and impact strength decreased. SEM micrographs showed that the graphite which was dispersed in the substrate was more likely to form the thermal chain and thermal Network with the increase of the content of graphite. When the graphite mass fraction was 50 % , the rate of thermal conductivity was 3.743W·m^-1·K^-1 , about 13. 91 times that of the pure matrix. The thermal diffusivity was 2. 344 mm2 / s , 15. 95 times that of the pure matrix. Compared the experimental data with the thermal conduction model, the obtained experimental data matched better with the thermal conduction model proposed by Y Agari. It was proved that the thermal conduction model proposed by Y Agari was suitable for low filled volume situations.