Influence of humidity treatment on electrical tree propagation in epoxy resin
Influence of humidity treatment on electrical tree propagation in epoxy resin
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DOI：
10.1109/tdei.2016.7736812
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发表时间：
2016-10
影响因子：
3.1
通讯作者：
S. Iwata
中科院分区：
文献类型：
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作者：
S. Iwata
聚合物材料的电绝缘性能因潮湿处理或吸水而降低。电树是一种预击穿现象，是聚合物降解的主要因素之一。在这项工作中，环氧树脂中的电树的结构和长度，在固化过程中有/没有湿度处理，通过高分辨率X射线计算机断层扫描（X-CT），使用同步辐射。X-CT结果表明，环氧树脂的老化与潮湿处理条件有关。特别是对电树有扩大延伸的作用。在放电雪崩（DA）模型中，材料的电离势是计算树枝生长速率的重要参数。在这项研究中，环氧分子的电离势，有/没有水溶剂效应，使用密度泛函理论（DFT）计算。通过DA模型和DFT计算，计算了电树的特征时间（有/无湿度效应），这些值与X-CT结果密切对应。
The electrical insulation performance of polymeric materials is degraded by humidity treatments or water absorption. An electrical tree is a pre-breakdown phenomenon and constitutes one of the main contributing factors to the degradation of polymers. In this work, the structure and length of the electrical tree in epoxy resin, with/without humidity treatment during curing, was determined by high-resolution X-ray computed tomography (X-CT), using synchrotron radiation. It is revealed from X-CT that the deterioration of the epoxy resin is associated with the conditions of humidity treatment. In particular, the treatment has an effect of enlarging and extending on electrical tree. The ionization potential of material is essential for evaluating the tree-propagation rate in the discharge-avalanche (DA) model. In this study, the ionization potential of the epoxy molecule, with/without water solvent effect, was calculated using by the density functional theory (DFT). The characteristic times of the electrical tree (with/without the humidity effect) were computed, via the DA model and DFT calculations, and these values corresponded closely to the X-CT results.