In order to explore the space charge behavior of liquid silicone rubber (LSR) the pulsed electroacoustic (PEA) method has been applied. Due to the elastic nature of LSR, the PEA setup was optimized to ensure a constant contact pressure and thus a constant thickness of the LSR samples. For each sample, the temperature of the ground and the high-voltage electrode was permanently measured. The space charge behavior was investigated for neat LSR and for LSR samples with two different amounts of nanoscaled carbon black (CB). The results show in general a formation of homocharges at both electrodes. At 20 °C, the negative charge from the cathode moves towards the anode in the case of neat LSR. With increasing amount of CB, the negative charge is trapped near the cathode and the charge migration is suppressed. At higher temperature, an increasing amount of positive homocharges at the anode is observed, which is suppressed for LSR with CB nanofillers. The mean charge density between the electrodes is evaluated during polarization and depolarization measurement. The results show that the mean charge density increases with temperature and electric field strength, which is explained by the Schottky and Poole-Frenkel effect. In addition, it is observed that the mean attenuation rate during the depolarization time increases with increasing amount of CB nanofillers.

中文翻译：

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温度和电场强度对含碳黑纳米填料的液态硅橡胶空间电荷行为的影响

为了探索液体硅橡胶 (LSR) 的空间电荷行为，已应用脉冲电声 (PEA) 方法。由于 LSR 的弹性性质，PEA 设置被优化以确保恒定的接触压力，从而确保 LSR 样品的恒定厚度。对于每个样品，地面和高压电极的温度都被永久测量。研究了纯 LSR 和具有两种不同量的纳米级炭黑 (CB) 的 LSR 样品的空间电荷行为。结果通常表明在两个电极上形成了同电荷。在 20 °C 时，在纯 LSR 的情况下，阴极的负电荷向阳极移动。随着 CB 量的增加，负电荷被捕获在阴极附近，电荷迁移受到抑制。在较高的温度下，观察到阳极处正同电荷量的增加，这对于使用 CB 纳米填料的 LSR 受到抑制。在极化和去极化测量期间评估电极之间的平均电荷密度。结果表明平均电荷密度随着温度和电场强度的增加而增加，这可以用肖特基效应和普尔-弗伦克尔效应来解释。此外，观察到去极化时间期间的平均衰减率随着 CB 纳米填料量的增加而增加。这可以通过肖特基效应和普尔-弗伦克尔效应来解释。此外，观察到去极化时间期间的平均衰减率随着 CB 纳米填料量的增加而增加。这可以通过肖特基效应和普尔-弗伦克尔效应来解释。此外，观察到去极化时间期间的平均衰减率随着 CB 纳米填料量的增加而增加。