采用原位聚合法制备了碳纳米管/聚丙烯腈(CNT/PAN)复合材料,用MDSC的测试方法研究了复合材料的热性能,并由此推导了复合材料的热导率.应用Cheng-Vachon、Nielsen-Lewis和Okamoto-Ishida 3种导热理论模型对CNT/PAN复合材料的热导率进行估算.对比实验测试与导热理论模型的计算结果,考虑到碳纳米管在聚合物基体中的分散和取向情况,得出Nielsen-Lewis理论在低填充含量及室温条件下可以较准确地估算无规分散的CNT/PAN复合材料体系的热导率.
The carbon nanotubes/polyacrylonitrile(CNT/PAN) nanocomposites are prepared using in-situ polymerization method. The thermal properties of the composites are measured by MDSC test and the thermal conductivity of the composites is calculated. Three theoretical thermal conductivity models including Cheng-Vachon, Nielsen-Lewis and Okamoto-Ishida models have been proposed respectively to predict the effective thermal conductivity of carbon nanotubes/polyacrylonitrile(CNT/PAN) composites. Compared with the calculation of the experiment, the theoretical equations are discussed in terms of the dispersion and orientation. The experimental data are in good agreement with that obtained from Nielsen-Lewis thermal conductivity theoretical model under the condition of low filler content at room temperature.
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