在分层环氧树脂接口的空间电荷特性
Yifan Zhang1,2, Bing Luo1,2, Mingli Fu1,2
1Electric Power Research Institute, China Southern Power Grid, Guangzhou 510663, China.
Molecules (Basel, Switzerland)
|July 29, 2023
概括
层状环氧树脂组件中的层间接口可以积累电荷,扭曲电场. 这项研究揭示了二次固化会产生弱交联,加剧电荷积累并引入深陷.
科学领域:
- 材料科学 材料科学 材料科学
- 电气工程 电气工程
- 聚合物化学 聚合物化学
背景情况:
- 具有复杂结构的环氧树脂绝缘元件通常使用多个注来制造,从而创建层状接口.
- 这些层间接口被认为是性能弱点,容易导致电荷积累和电场扭曲.
- 有限的研究集中在这些环氧树脂层间接口的特定行为上.
研究的目的:
- 为了研究层状环氧树脂的层间接口的空间电荷积累和陷特性.
- 了解这些接口上的电荷行为的潜在机制.
- 为减轻环氧树脂绝缘材料的界面电荷积累提供见解.
主要方法:
- 用和没有层间接口的环氧树脂样品的制备.
- 使用脉冲电声学 (PEA) 方法分析空间电荷积累.
- 通过热刺激脱极化电流 (TSDC) 分析来描述陷特性.
主要成果:
- 麦克斯韦-瓦格纳接口极化模型本身不足以解释观察到的接口电荷积累.
- 由于功能组之间的反应,二次固化导致界面上的交叉连接网络较弱.
- 温度升高会在弱交链区域激活分子链段,引入深陷并加剧电荷积累.
- 接口极化和弱交叉连接减少了接口电荷对场强度扭曲的影响,因为应用场强度增加.
结论:
- 该研究阐明了环氧树脂层间接口中空间电荷积累的复杂机制,涉及弱交联和深陷引入.
- 研究结果表明,接口极化和弱交叉连接影响了接口电荷和电场扭曲之间的关系.
- 这项研究为了解界面电荷传输提供了理论基础,并提出了控制界面交叉连接的策略,以抑制环氧树脂绝缘材料中的电荷积累.
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