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首页> 外文期刊>Journal of Applied Polymer Science >Electrical properties of composites in the vicinity of the percolation threshold
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Electrical properties of composites in the vicinity of the percolation threshold

机译：渗透阈附近的复合材料的电性能

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摘要

The electrical response of thermoplastic composites composed of carbon black and high-density polyethylene near the electrical percolation threshold (pc) has been investigated through the study of the volume resistivity and complex permittivity. The change in conductivity beyond pc exhibited a critical exponent that was greater than predicted from percolation theory. Composites with carbon black contents slightly larger than pc exhibited the greatest sensitivity in volume resistivity with temperature variations under the melting point of polyethylene. In addition, percolating composites with low carbon black contents exhibited significant 'negative temperature coefficient' (NTC) effects and improvements in conductivity with annealing. Maxwell-Wagner interfacial polarization resulted in moderate increases in both the permittivity (ε prime ) and dielectric loss factor (ε double prime ) below pc, while at percolation, an abrupt and dramatic increase was observed for both components of the complex permittivity.
机译：通过研究体积电阻率和复介电常数，研究了由炭黑和高密度聚乙烯组成的热塑性复合材料在电渗透阈值（pc）附近的电响应。 pc以外的电导率变化表现出的临界指数大于渗滤理论预测的临界指数。炭黑含量略大于pc的复合材料在聚乙烯熔点以下随温度变化的体积电阻率方面表现出最大的敏感性。此外，具有低炭黑含量的渗滤复合材料表现出显着的“负温度系数”（NTC）效果，并随着退火而改善了导电性。 Maxwell-Wagner界面极化导致介电常数（εprime）和介电损耗因子（εdouble prime）均适度增加，低于pc，而在渗流时，观察到复介电常数的两个分量都急剧而急剧地增加。

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