In the current study, polylactic acid/high density polyethylene/carbon black (PLA/HDPE/CB) composites are prepared via a two‐step method. A double percolation network with co‐continuous structure and filler distribution at the interface is constructed to design conductive polymer composites with low percolation threshold. The controllable distribution of CB at the interface is achieved by appropriate processing procedures involved mixing sequence and mixing time by taking advantage of the migration of CB from the unfavorable PLA phase to the favorable HDPE phase. Morphology characterization reveals that when the mixing time of the added HDPE is 3 min, the formation of co‐continuous structure of PLA/HDPE (60/40, w/w) is observed, and CB particles migrate to the co‐continuous interface. The electrical conductivity measurement shows that such double percolation conductive network reduces the percolation threshold of PLA/HDPE/CB to 2.42 wt%. The rheological property proves the establishment of particle percolation network, and the rheological percolation threshold is determined as 1.20 wt%. The prepared PLA/HDPE/CB composite by the two‐step method displays a notably low percolation threshold than that prepared by one‐step simultaneous mixing. Moreover, this strategy presents a high potential application in the fabrication of conductive polymer composites involving other miscible multiphase systems.

中文翻译：

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通过将炭黑置于共连续共混物的界面处，制备具有低渗透阈值的导电聚乳酸/高密度聚乙烯/炭黑复合材料

在当前的研究中，聚乳酸/高密度聚乙烯/炭黑（PLA / HDPE / CB）复合材料是通过两步法制备的。构建了具有共连续结构和界面处填料分布的双渗透网络，以设计具有低渗透阈值的导电聚合物复合材料。CB在界面处的可控分布是通过适当的加工程序实现的，包括混合顺序和混合时间，这些过程都利用了CB从不利的PLA相向有利的HDPE相的迁移。形态学特征表明，当添加的HDPE的混合时间为3分钟时，观察到PLA / HDPE共连续结构的形成（60/40，w / w），并且CB颗粒迁移到共连续界面。电导率测量表明，这种双重渗滤导电网络将PLA / HDPE / CB的渗滤阈值降低至2.42 wt％。流变性质证明了颗粒渗流网络的建立，流变渗流阈值确定为1.20 wt％。通过两步法制备的PLA / HDPE / CB复合材料的渗透阈值明显低于通过一步法同时混合制备的渗透阈值。此外，该策略在涉及其他可混溶多相系统的导电聚合物复合材料的制造中具有很高的应用潜力。20重量％。通过两步法制备的PLA / HDPE / CB复合材料的渗透阈值明显低于通过一步法同时混合制备的渗透阈值。此外，该策略在涉及其他可混溶多相系统的导电聚合物复合材料的制造中具有很高的应用潜力。20重量％。通过两步法制备的PLA / HDPE / CB复合材料的渗透阈值明显低于通过一步法同时混合制备的渗透阈值。此外，该策略在涉及其他可混溶多相系统的导电聚合物复合材料的制造中具有很高的应用潜力。