Physicochemical Characteristics and Dynamic Charge Mapping in Thermally Aged Two-Layered Polymer Considering Surface States: Experiment and Simulation
Physicochemical Characteristics and Dynamic Charge Mapping in Thermally Aged Two-Layered Polymer Considering Surface States: Experiment and Simulation
复制标题
DOI：
10.3390/polym12030634
复制
发表时间：
2020-03-01
期刊：
影响因子：
5
通讯作者：
Sun, Potao
中科院分区：
文献类型：
--
作者：
Jiang, Xiongwei;Sima, Wenxia;Sun, Potao
在高电场和高温的操作条件下，多层绝缘界面处的空间电荷的积累通常被认为是影响绝缘性能的重要因素。本研究实验探讨了不同的热老化程度（110 ℃，0，720，1600，2100和2900小时）的理化特性的影响。采用脉冲电声（PEA）方法测量了双层热老化PET-PET薄膜中的空间电荷动力学，并在一维修正的双极电荷输运模型的基础上进行了模拟。通过参数敏感性分析了模型中关键参数的参数化问题。结果表明，PET薄膜的分子结构、结晶度和介电谱受热老化的影响。热化过程对表面态特性也有显著影响，表现为陷阱深度和陷阱密度增大。在数值模拟的基础上观察到了PEA方法测量的几个实验现象。
Under operational conditions of high electric fields and elevated temperatures, the accumulation of space charges at multilayer insulation interfaces is often considered as an important factor affecting insulation performance. This study experimentally explored the influence of different thermal aging degrees (110 degrees C for 0, 720, 1600, 2100, and 2900 h) on physicochemical characteristics. The space charge dynamics in two-layered thermally aged PET-PET films were measured using the pulsed electro-acoustic (PEA) method and simulated on the basis of a one-dimensional modified bipolar charge transport model. The parameterization for key parameters involved in the model was analyzed through parameter sensitivity. Results indicated that the molecular structure, crystallinity, and dielectric spectra of the PET films are affected by thermal aging. The thermalization process also has noticeable effect on the surface state characteristics, which are characterized by deeper trap depth and larger trap density. Several experimental phenomena measured by the PEA method were observed on the basis of numerical simulation.