含氟聚合物/多壁碳纳米管复合材料的导热性能

Thermal Conduction Property of Fluoropolymer/multi-walled Carbon Nanotubes Composites

为提高含氟聚合物F2314的导热性能,采用多壁碳纳米管(MWCNTs)对F2314进行改性。用密炼混合法制备了F2314/MWCNTs复合材料。研究了MWCNTs含量、温度对F2314/MWCNTs复合材料的导热系数的影响。建立了F2314/MWCNTs复合材料的导热模型。结果表明,F2314/MWCNTs复合材料的导热系数随MWCNTs含量增加而增大。当MWCNTs质量分数为30%时,30℃下F2314/MWCNTs复合材料的导热系数高达0.647 W·m^(-1)·K^(-1),比纯F2314的导热系数提高3.43倍。F2314/MWCNTs复合材料的导热性能对温度的依赖性与F2314的相态转变密切相关。随着温度增加,F2314/MWCNTs复合材料的导热系数先增加,然后在玻璃化转变温度附近达到最大值,接着逐渐降低。有效介质方法修正公式的计算结果与实验吻合较好,表明该公式可以较好地模拟F2314/MWCNTs复合材料的导热性能。

To improve the thermal conduction properties of fluoropolymer （F2314）, the F2314 was modified by multi-walled carbon nanotubes （MWCNTs）. The F2314/MWCNTs composites were prepared by a internal melt mixing method. The effects of MWCNTs content and temperature on the thermal conductivity of F2314/MWCNTs composites were studied. A thermal conduction model for F2314/MWCNTs composites was established. The results show that the thermal conductivity of F2314/MWCNTs composite increases with increasing the MWCNTs content. When the mass fraction of MWCNTs is 0.30, the thermal conductivity of F2314/MWCNTs composite at 30 ℃ is 0.647W·m^-1·K^-1 , which is 3.43 times higher than that of pure F2314. The depend- ence of thermal conduction property of F2314/MWCNTs composite on the temperature is closely related to the phase transition of F2314. With the increase of temperature, the thermal conductivity of F2314/MWCNTscomposite increases firstly, then reachesa maximum near the glass transition temperature, and then decreases gradually. The theoretical calculated results according to the modified model of effective medium approach and experimental ones have a good consistency, indicating that the formula can ef- fectively simulate the thermal conduction property of F2314/MWCNTs composite.