中文摘要：

通过将碳纳米管（CNTs）用混酸进行处理后在其表面以正辛醇（C8H17OH）进行接枝处理,制得接枝C8H17O-CNTs。经红外光谱分析,所得接枝产物出现区别于C8H17OH上的C-O键特征吸收峰,表明接枝成功。在熔融的石蜡（PW）中加入接枝产物并进行搅拌和恒温超声后制得均匀复合物。复合物导热系数的测量结果表明,随温度的升高纯PW和各个组成的复合物的导热系数基本呈现下降趋势。复合物的导热系数基本随C8H17O-CNTs的含量的增加而增大。其中含质量分数为1.0%C8H17O-CNTs的复合物的导热系数较纯PW的导热系数在各个测量温度都提高了大约0.06 Wm-1K-1。

英文摘要：

Pristine CNTs were treated by concentrated acid mixture to add-COOH groups on the surfaces.Octanol（C8H17OH）was used to graft the CNTs after the acid treatment to get C8H17O-CNTs.IR spectra showed the characteristic bands of the C8H17O-CNTs.The C8H17O-CNTs were dispersed into paraffin wax（PW） with intensive sonication to prepare phase change composites.The results of the thermal conductivity measurement showed that the thermal conductivities of the composites decreased with an increase of the temperature.The thermal conductivities of the composites generally increase with the loading of C8H17O-CNTs.The mass fraction of C8H17O-CNTs 1.0 % enhanced the thermal conductivity about 0.06 Wm-1K-1 at each tested temperature,compared with PW.