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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Ac conductance and capacitance of carbon black polymer composites during thermal cycling and isothermal annealing
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Ac conductance and capacitance of carbon black polymer composites during thermal cycling and isothermal annealing

机译：炭黑聚合物复合材料热循环和等温退火过程中的交流电导率和电容

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摘要

The ac electrical properties of acetylene black composites mixed into ethylene butylacrylate copolymer (EBA) and into poly (methyl methacrylate) (PMMA) have been measured in thermal cycling and isothermal annealing experiments. The results show that changes in electrical properties are due to rearrangement of gaps between the carbon black aaarecates. This has been concluded using an exponent z that relates the critical frequency w(c), denoting the crossover of the conductivity from the dc-plateau to its frequency-dependent part to the dc conductivity, sigma(dc). according to w(c) infinity sigma(dc) Below the melting ran-e of EBA and the glass transition of PMMA z is about one corresponding to strong variation of the conductivity and weak dependence of the permittivity on the gaps. Above the melting range of EBA z is about 1.5, indicating strong dependence of both the conductivity and the permittivity on the gaps, as predicted by percolation theory. This was not found In the PMMA composites above the glass transition. We conclude that the polymer matrix affects the nature of the gaps between carbon black aggregates, either allowing their size to vary continuously (z about 1) or letting them open and close (z about 1.5). [References: 15]
机译：已在热循环和等温退火实验中测量了混入乙烯丙烯酸丁酯共聚物（EBA）和聚甲基丙烯酸甲酯（PMMA）中的乙炔黑复合材料的交流电性能。结果表明，电性能的变化归因于炭黑aacateates之间的间隙的重新排列。这是使用与临界频率w（c）相关的指数z得出的，该指数表示从dc平稳区到其频率相关部分的电导率与dc电导率sigma（dc）的交叉。根据w（c）无穷大σ（dc），在EBA的熔化范围和PMMA z的玻璃化转变温度以下约为1，这对应于电导率的强变化和介电常数对间隙的弱依赖性。在EBA z的熔化范围之上，约为1.5，表明电导率和介电常数均对间隙的强烈依赖性，这是通过渗流理论预测的。在玻璃化转变温度以上的PMMA复合材料中未发现这一点。我们得出的结论是，聚合物基质会影响炭黑团聚体之间间隙的性质，或者允许其大小连续变化（z约为1）或打开和关闭（z约为1.5）。 [参考：15]

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