Abstract Nanocomposites made of blends of polyamide (PA66), polyphthalamide (PA6T), and poly(2,6-dimethyl-1,4-phenylene ether) (PPE) with multi-walled carbon nanotubes (CNTs) were investigated. At 1 wt% CNT loading, the electrical conductivities of PA66/PA6T/PPE/CNT nanocomposites were around four orders of magnitude larger than those of PA66/PPE/CNT nanocomposites without PA6T. Line mapping images and spot spectrum results from transmission electron microscopy/energy dispersive spectroscopy analysis showed that the continuous phase contained PA66 and PA6T with dispersed PPE domains. Phase inversion was observed as the CNT content of PA6T/PPE/CNT increased. Depending on the polymer composition, alignment of some of CNTs at the interface was observed. Using the wetting coefficient analysis and the Hansen solubility parameter, the morphologies of the nanocomposites and the resulting electrical conductivities were found to be affected by the compatibilizing effect of PA6T on PA66 and PPE as well as the higher affinity of CNTs for PA6T than for PPE or PA66. CNTs were observed to help maintain the integrity of the PA66/PA6T continuous phase by dynamic mechanical analysis.

中文翻译：

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PA6T对PA66/PA6T/PPE/多壁碳纳米管纳米复合材料形貌和电导率的影响

摘要 研究了由聚酰胺 (PA66)、聚邻苯二甲酰胺 (PA6T) 和聚 (2,6-二甲基-1,4-苯醚) (PPE) 与多壁碳纳米管 (CNT) 的共混物制成的纳米复合材料。在 1 wt% CNT 负载量下，PA66/PA6T/PPE/CNT 纳米复合材料的电导率比没有 PA6T 的 PA66/PPE/CNT 纳米复合材料的电导率高约四个数量级。来自透射电子显微镜/能量色散光谱分析的线映射图像和点光谱结果表明，连续相包含 PA66 和 PA6T，并具有分散的 PPE 域。随着 PA6T/PPE/CNT 的 CNT 含量增加，观察到相转化。根据聚合物组成，观察到一些 CNT 在界面处的排列。使用润湿系数分析和汉森溶解度参数，发现纳米复合材料的形态和由此产生的电导率受 PA6T 对 PA66 和 PPE 的增容作用以及 CNT 对 PA6T 的亲和力高于对 PPE 或 PA66 的亲和力的影响。通过动态力学分析观察到碳纳米管有助于保持 PA66/PA6T 连续相的完整性。