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首页> 外文期刊>Journal of Applied Polymer Science >Preparation of conductive polylactic acid/high density polyethylene/carbon black composites with low percolation threshold by locating the carbon black at the Interface of co-continuous blends
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Preparation of conductive polylactic acid/high density polyethylene/carbon black composites with low percolation threshold by locating the carbon black at the Interface of co-continuous blends

机译：通过在连续混合物界面处定位炭黑，用低渗透阈值制备导电聚乳酸/高密度聚乙烯/炭黑复合材料

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摘要

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.
机译：本研究采用两步法制备了聚乳酸/高密度聚乙烯/炭黑（PLA/HDPE/CB）复合材料。为了设计低渗流阈值的导电聚合物复合材料，构建了一个具有连续结构和界面填料分布的双渗流网络。通过适当的处理程序，包括混合顺序和混合时间，利用CB从不利PLA相向有利HDPE相的迁移，实现界面处CB的可控分布。形貌表征表明，当加入HDPE的混合时间为3min时，PLA/HDPE（60/40，w/w）形成共连续结构，CB颗粒向共连续界面迁移。电导率测量表明，这种双渗流导电网络将PLA/HDPE/CB的渗流阈值降低到2.42 wt%。流变特性证明了颗粒渗流网络的建立，流变渗流阈值确定为1.20 wt%。与一步同时混合法制备的PLA/HDPE/CB复合材料相比，两步法制备的PLA/HDPE/CB复合材料的渗流阈值明显较低。此外，该策略在涉及其他可混溶多相体系的导电聚合物复合材料的制备中具有很高的潜力。

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