Wang Yu, Liu Song, Zhu Huihao, Ji Huajian, Li Guo, Wan Zhou, Ma Yulu, Xie Linsheng
School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China.
Polymers (Basel). 2021 Mar 21;13(6):961. doi: 10.3390/polym13060961.
In this work, carbon black (CB)/polyamide 6 (PA6)/polypropylene (PP) microfibrillar composites (MFCs) were fabricated through an extrusion (hot stretching) heat treatment process. The CB-coated conductive PA6 microfibrils with high aspect ratio were in situ generated as a result of the selective accumulation of CB at the interface. At the proper temperature, a 3D entangled conductive structure was constructed in the PP matrix, due to topological entanglement between these conductive microfibrils. This unique conductive structure provided the PP composites with a low electrical conductivity percolation threshold. Moreover, the electromechanical properties of conductive MFCs were investigated for the first time. A great stability, a high sensitivity and a nice reproducibility were achieved simultaneously for CB/PA6/PP MFCs. This work provides a universal and low-cost method for the conductive polymer composites' (CPCs) fabrication as sensing materials.
在本工作中，通过挤出（热拉伸）热处理工艺制备了炭黑（CB）/聚酰胺6（PA6）/聚丙烯（PP）微纤复合材料（MFCs）。由于CB在界面处的选择性积累，原位生成了具有高长径比的CB包覆导电PA6微纤。在适当温度下，由于这些导电微纤之间的拓扑缠结，在PP基体中构建了三维缠结导电结构。这种独特的导电结构使PP复合材料具有低的电导率渗流阈值。此外，首次研究了导电MFCs的机电性能。CB/PA6/PP MFCs同时实现了高稳定性、高灵敏度和良好的重现性。这项工作为制备作为传感材料的导电聚合物复合材料（CPCs）提供了一种通用且低成本的方法。
