Conductive composites based on polymers and conductive nanofillers are widely studied as a promising material. The rational design of 3D conductive networks in composites is crucial to improve their electrical conductivity and reduce the dosage of nanofillers. Herein, poly(vinylidene fluoride) (PVDF) and polystyrene (PS) bi‐continuous structures with modified carbon nanotubes (CNTs) tailored to anchor at the interface are designed to achieve an ultralow electrical percolation threshold because of the formation of a thin interfacial conductive layer. In this work, the modification of CNTs with poly(methyl methacrylate) (PMMA), which contributes to the improvement of the compatibility between PVDF and CNTs, is effective to control the distribution of CNTs in composites. It promotes the migration of CNTs from the PS phase to the interface of PVDF and PS. Consequently, the interfacial conductive layer is formed at a low CNT content, and the electrical percolation threshold of PVDF/PS/CNTs‐PMMA nanocomposites is only 0.07 vol%, having a great decrease of about 50% compared with that of PVDF/PS/CNTs nanocomposites. Thus, it is demonstrated that the distribution of CNTs can be tailored to anchor at the interface by proper chemical modification to form an interfacial conductive layer and a decrease of percolation threshold can also be achieved.

中文翻译：

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一种有效的策略，通过将纳米碳管固定在PVDF / PS双连续结构的界面上以形成界面导电层，从而实现超低电渗阈值

基于聚合物和导电纳米填料的导电复合材料被广泛研究为有前途的材料。复合材料中3D导电网络的合理设计对于提高其导电性并减少纳米填料的用量至关重要。在这里，聚偏二氟乙烯（PVDF）和聚苯乙烯（PS）的双连续结构以及经过修饰的碳纳米管（CNT）专门用于锚固在界面上，由于形成了薄的界面导电层，因此设计可实现超低电渗阈值层。在这项工作中，用聚甲基丙烯酸甲酯（PMMA）改性CNT，有助于改善PVDF与CNT之间的相容性，可有效控制CNT在复合材料中的分布。它促进了CNT从PS相向PVDF和PS界面的迁移。因此，在CNT含量低的情况下形成了界面导电层，PVDF / PS / CNTs-PMMA纳米复合材料的电渗流阈值仅为0.07 vol％，与PVDF / PS /相比大大降低了约50％。 CNTs纳米复合材料。因此，证明了可以通过适当的化学修饰来调整CNT的分布以锚定在界面上，以形成界面导电层，并且还可以实现降低渗透阈值。