增塑PVC薄膜在击穿阈值电压附近的导电状态变化
Conductivity states changes in plasticized PVC films near breakdown threshold voltages values
摘要：
研究了PVC薄膜电导率的近阈值“软击穿”测量。在较宽的外电场强度范围内，各种厚度（>20 mkm）的PVC薄膜的电阻表现出很强的非线性，在接近击穿阈值时似乎进入高导电状态。对于我们的“厚”膜边界条件，电极表面特性不应该像在薄聚合物膜实验中那样重要。观察到快速、瞬时的非线性机制，以及累积和延迟响应的影响。对应于具有相当高的导电性的状态下的可逆转变的现象，似乎是类似于先前登记的一些宽带隙聚合物的薄层。在远离击穿阈值的较低场强范围内，标准测量池中的聚合物膜由于正常和高阻态之间的可逆转换而形成弛豫发生器，产生足够大的声音信号，其频率随外场的增加而增加。
英文摘要：
The near threshold "soft breakdown" measurements of PVC films conductivity are investigated. In a wide range of external electric field strength for various rather thick (>20 mkm) PVC films the resistance shows strong nonlinearity and seems to enter high conductive state close to the breakdown threshold. For our "thick" films boundary conditions electrode surface specifics should not be so important as in thin polymer films experiments. Both fast, instant mechanisms of nonlinearity, and effects of accumulation and delay responce were observed. The phenomena corresponding to reversible transitions in a state with rather high conductivity, seems to be similar to ones registered earlier in thin layers of some broad-bandgap polymers. In a range of relatively low field intensity, far from a threshold breakdown, as a result of reversible switches between normal and high resistivity states a polymer film in a standard measuring cell formed a relaxation generator giving a loud enough sound signal with frequency increasing with the increase of external field.
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