The dispersion and distribution of carbon nanotubes (CNTs) on/in the polymer composites are greatly affected by the molding technology progress, which results in different electrical conductivity. The uncontrollable electrical conductivity has limited the application of conductive polymer composites, for example, sensor components. In this work, to enhance the dispersion stability of CNTs in polyethylene (PE) matrix, sub-micron calcium carbonate isolated CNTs (smCaCO₃@CNTs) were selected based on the fact that smCaCO₃ is much easier to disperse in polymer in comparison with CNTs. This good distribution of CNTs in smCaCO₃@CNTs/PE was characterized by transmission electron microscope and Raman mapping. The electrical performance test results show that when 0.5 wt% of CNTs filled in smCaCO₃@CNTs/PE, the percolation network begins to form; when CNTs filled increases to 1-2 wt%, the surface resistance of smCaCO₃@CNTs/PE ranges from 10⁶ to 10⁹Ω almost not affected by the molding technology process (compression molding or injection molding). The possible reason is that the isolated CNTs by smCaCO₃ in polymer matrix are favorable for the formation of the stable conductive network.

中文翻译：

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具有可控电导率的亚微米碳酸钙分离碳纳米管/聚乙烯复合材料

碳纳米管（CNTs）在聚合物复合材料上/内的分散和分布受成型技术进步的影响很大，从而导致不同的电导率。不可控的导电性限制了导电聚合物复合材料的应用，例如传感器组件。在这项工作中，为了提高 CNTs 在聚乙烯 (PE) 基质中的分散稳定性，基于 smCaCO ₃与聚合物相比更容易分散在聚合物中的事实，选择了亚微米碳酸钙分离的 CNTs (smCaCO ₃ @CNTs)碳纳米管。碳纳米管在 smCaCO _{3 中的}这种良好分布@CNTs/PE 的特点是透射电子显微镜和拉曼映射。电性能测试结果表明，当0.5 wt%的CNTs填充在smCaCO ₃ @CNTs/PE中时，渗流网络开始形成；当碳纳米管填充量增加到 1-2 wt% 时，smCaCO ₃ @CNTs/PE的表面电阻范围为 10 ⁶至 10 ⁹ Ω，几乎不受成型技术工艺（压缩成型或注射成型）的影响。可能的原因是聚合物基体中smCaCO ₃分离的CNTs有利于形成稳定的导电网络。