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首页> 外文期刊>Composites Science and Technology >Theoretical modeling and experimental verification of percolation threshold with MWCNTs' rotation and translation around a growing bubble in conductive polymer composite foams
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Theoretical modeling and experimental verification of percolation threshold with MWCNTs' rotation and translation around a growing bubble in conductive polymer composite foams

机译：MWCNTS旋转阈值的理论建模与实验验证，导电聚合物复合泡沫生长泡沫旋转及翻译

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摘要

Foaming is a potential method to prepare high-performance, lightweight, composite materials with enhanced electrical properties. Here, a theoretical model and its experimental verification are presented to assess the evolution of electrical percolation threshold and conductivity as a bubble grows during the foaming of conductive filler/polymer composites. The filler networks were changed by translation and rotation of filler particle during bubble growth that was presented by void fraction increase. The evolution of percolation threshold with filler network was estimated using a Monte Carlo approach. The model results showed that the percolation threshold decreased, and the electrical conductivity increased for void fraction values less than 20%, beyond which the percolation threshold started to increase. Furthermore, a series of polystyrene/multiwalled carbon nanotubes (PS/MWCNTs) composite foams were fabricated at various void fractions matching the parameters in modeling. At an optimum void fraction of approximately 17%, the percolation threshold of the foamed samples was decreased by 20%, from 0.6 vol% down to 0.48 vol%. Further increases in the void fraction increased the percolation threshold. The simulation prediction was in good agreement with the experimental results. The model offers a valuable tool to better understand the electrical behavior and can be used in the design of conductive polymer composite foams with rod-like conductive fillers.
机译：发泡是一种制备具有增强电性能的高性能，轻质复合材料的潜在方法。这里，提出了理论模型及其实验验证以评估电渗滤阈值和导电性的演变，因为在导电填料/聚合物复合材料的发泡过程中的气泡生长。通过在泡沫馏分增加期间通过翻译和填料旋转改变填充网络，其通过空隙馏分增加给出。利用蒙特卡罗方法估计利用填料网络的渗透阈值的演变。模型结果表明，渗透阈值降低，并且对于空隙率馏分值的电导率增加，超过20％，超出其渗透阈值开始增加。此外，在与建模中的参数匹配的各种空隙级分中制造一系列聚苯乙烯/多晶碳纳米管（PS / MWCNT）复合泡沫。在约17％的最佳空隙率下，泡沫样品的渗透阈值下降20％，从0.6体积％降至0.48体积％。进一步增加空隙率增加了渗透阈值。模拟预测与实验结果很好。该模型提供了一个有价值的工具，可以更好地理解电动行为，并且可以用于具有棒状导电填料的导电聚合物复合泡沫的设计。

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