石墨填充高密度聚乙烯基复合材料导热性能的研究

Studies on the Thermal Conductivity of HDPE/C Composites

选用导热系数较高的无机填料石墨对高密度聚乙烯（HDPE）进行填充改性；采用偶联剂和磨盘型力化学反应器对石墨进行表面处理，提高石墨与聚合物基体的界面相互作用；用自行研制的升温速率测定装置测试材料的导热性能，并研究材料的导热机理；用SEM观察复合材料的微观形态．实验结果表明：经偶联剂处理后，石墨在HDPE中均匀分布；测试试样的上表面温度随时间的变化可用三次多项式T=A0+A1t+A2t2＋A3t3拟会；HDPE／石墨复合材料升温速率随石墨含量增加而增大；石墨含量为35％的复合材料最大升温速率为HDPE的1.75倍．

Thermal conductivity of HDPE/C composites and its mechanism were studied through SEM and thermal conductivity measurement. The results show that after being treated with coupling agent through pan-milling, the graphite particles will uniformly disperse in HDPE matrix, the interface interaction between graphite and HDPE enhances quite a lot.The temperature detected on the sample surface vs. time shows an excellent agreement with third-polynomial regression: T = A0+ A1t + A2t2 + A3t3.The thermal conductivity of HDPE/C is much higher than that of HDPE, the temperature-increasing rate of HDPE/C(65/35) composite reaches 1. 75 times of that of HDPE.