Abstract Herein, a series of electrically conductive polyurethane composites with multi-walled carbon nanotubes (PU/MWCNTs) were in-situ polymerized according to tailoring the segmented PU molecules. The ultralow percolation threshold of MWCNTs (0.057 wt%) in the composites was achieved and the electrically conductive properties were markedly enhanced. The conductivity in PU@MWCNTs1-0.5 % and PU@MWCNTs2-0.5 % was lower than 1.0 × 10−1° S m-1. While PU@MWCNTs3-0.5 % had the conductivity of over 1.0 × 10-6 S m-1, almost 4 orders of significance, which was attributed to the increasing of hard segments on the PU molecule. Furthermore, the high piezoresistive properties of the composites were also observed. Therefore, this work had the important sense in decreasing the low percolation thresholds of conductive polymer composites.

中文翻译：

---

调整分段PU分子对PU/MWCNTs纳米复合材料导电性能和渗透阈值的影响研究

摘要 在此，通过对分段的 PU 分子进行定制，原位聚合了一系列具有多壁碳纳米管 (PU/MWCNTs) 的导电聚氨酯复合材料。实现了复合材料中 MWCNTs (0.057 wt%) 的超低渗透阈值，并显着增强了导电性能。PU@MWCNTs1-0.5 % 和 PU@MWCNTs2-0.5 % 的电导率低于 1.0 × 10−1° S m-1。而 PU@MWCNTs3-0.5 % 的电导率超过 1.0 × 10-6 S m-1，几乎有 4 个数量级的显着性，这归因于 PU 分子上硬链段的增加。此外，还观察到复合材料的高压阻特性。因此，这项工作对降低导电聚合物复合材料的低渗透阈值具有重要意义。