In this study, three different types of nanocomposites with random (r-CPC), segregated (s-CPC) and semi-segregated (ss-CPC) distribution of carbon nanotubes in High Density Polyethylene matrix were fabricated using hot compaction method. Microstructure of nanocomposite samples were observed by Scanning Electron Microscopy, which revealed the formation of carbon nanotubes conductive network at the polymer granule interfaces in segregated structure. While, partial formation of segregated structure was shown in semi-segregated samples. A significant reduction of Young modulus and strength of s-CPC6 and ss-CPC6 compared to r-CPC6 nanocomposite has been correlated to weak interface and voids between HDPE granules in segregated structure. DSC results proved that the crystallinity index of HDPE decreases when the distribution of CNTs in polymer matrix changes from segregated to random structure. Electrical conductivity was measured using four-point probe. Segregated structure samples showed electrical conductivity up to 9 and 5 order of magnitude larger than semi-segregated and random structure nanocomposites, respectively. Nanocomposites follow percolation behavior and applying percolation theory showed a decrease in percolation threshold from 7.1 vol% in r-CPC to 0.099 vol% in s-CPC. Finally, Electromagnetic Interference shielding properties were studied and the highest Shielding Effectiveness (SE) was obtained 21.8 dB in segregated sample at 6 wt% CNTs. While, in random structure the highest EMI SE was 9 dB at 20 wt% CNTs. Absorption and reflection were the dominant shielding mechanisms in segregated and random structure nanocomposites, respectively.

在这项研究中，使用热压法制造了三种不同类型的纳米复合材料，其中碳纳米管在高密度聚乙烯基体中具有随机 (r-CPC)、偏析 (s-CPC) 和半偏析 (ss-CPC) 分布。通过扫描电子显微镜观察纳米复合材料样品的微观结构，表明在分离结构的聚合物颗粒界面处形成了碳纳米管导电网络。而在半离析样品中，部分形成了离析结构。与 r-CPC6 纳米复合材料相比，s-CPC6 和 ss-CPC6 的杨氏模量和强度的显着降低与分离结构中 HDPE 颗粒之间的弱界面和空隙有关。DSC结果证明，当聚合物基体中碳纳米管的分布从偏析结构变为无规结构时，HDPE的结晶度指数降低。使用四点探针测量电导率。分离结构样品的电导率分别比半分离和随机结构纳米复合材料高 9 和 5 个数量级。纳米复合材料遵循渗透行为，应用渗透理论表明，渗透阈值从 r-CPC 中的 7.1 vol% 降低到 s-CPC 中的 0.099 vol%。最后，研究了电磁干扰屏蔽特性，在 6 wt% CNT 的分离样品中获得了最高屏蔽效率 (SE) 21.8 dB。而在随机结构中，最高 EMI SE 在 20 wt% CNT 时为 9 dB。