Abstract

Multi-walled carbon Nanotube (MWCNT) fillers are extensively used to improve the thermomechanical properties of polymers. In this study, five different weight fractions (0%, 0.25%, 0.50%, 0.75%, and 1%) of MWCNT-polymer nanocomposites were prepared by the solution mixing technique. The thermal conductivity of MWCNT-polymer nanocomposites was investigated using the laser flash method. The closed-form solution of the modified Mori-Tanaka homogenization method was developed for the accurate estimation of the thermal conductivity of nanocomposite materials after considering the influence of interfacial thermal resistance (ITR). The finite element simulation of RVE modelling was utilized to predict the thermal conductivity of nanocomposites with and without consideration of the interfacial thermal resistance effect. A perfect bond was assumed between MWCNT and polymer for both numerical and analytical studies. The thermal conductivity results obtained from the closed-form solution of the modified Mori-Tanaka method were in good agreement with both the finite element simulation (FEM) and experimental results.

摘要

多壁碳纳米管（MWCNT）填料广泛用于改善聚合物的热机械性能。在这项研究中，通过溶液混合技术制备了五种不同重量分数（0％、0.25％、0.50％、0.75％和1％）的MWCNT-聚合物纳米复合材料。采用激光闪光法研究了多壁碳纳米管-聚合物纳米复合材料的热导率。在考虑界面热阻（ITR）的影响后，改进的 Mori-Tanaka 均匀化方法的封闭式解决方案被开发出来，用于准确估计纳米复合材料的导热率。利用 RVE 建模的有限元模拟来预测考虑和不考虑界面热阻效应的纳米复合材料的热导率。在数值和分析研究中均假定多壁碳纳米管和聚合物之间存在完美结合。从改进的 Mori-Tanaka 方法的闭式解中获得的热导率结果与有限元模拟 (FEM) 和实验结果非常吻合。