微观结构对聚乙烯-蒙脱土纳米复合材料击穿特性的影响,Journal of Applied Polymer Science

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微观结构对聚乙烯-蒙脱土纳米复合材料击穿特性的影响
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2022-06-07 , DOI: 10.1002/app.52678
Lili Li ₁ , Yulong Wang ₁ , Junguo Gao ₁ , Xiaohong Chi ₂ , Gang Han ₃ , Ning Guo ₁

Affiliation

聚乙烯 (PE) 在电气和电子产品中有着广泛的应用。但是PE绝缘材料的使用寿命短，在电力系统运行过程中存在安全隐患。为了解决这个问题，开发了聚乙烯-蒙脱石（PE-MMT）纳米复合材料的分子模型，以模拟和探索影响其分解特性的微观机制。通过无序掺杂获得负载 0、3.3、4.0 或 5.1 wt% 有机改性 MMT 的 PE-MMT 纳米复合材料。X 射线衍射和扫描电子显微镜实验证明了改性这些纳米填料并将它们分散在 PE 中的效果，而径向分布函数、相互作用能和分数自由体积研究揭示了纳米复合材料的微米级特征。PE-MMT纳米复合材料中形成氢键，4.0 wt%纳米填料的纳米复合材料表现出比纯PE更好的击穿性能。模拟结果与从实验类似物收集的数据一致，这证实了本文描述的 PE-MMT 纳米复合材料模型的准确性和有效性。因此，本研究的结果既提供了研究 PE 击穿的模型，也提供了改进 PE 作为绝缘材料的改进程序。

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Effects of microstructure on the breakdown characteristics of polyethylene–montmorillonite nanocomposites

Polyethylene (PE) has numerous applications in electrical and electronic products. However, PE insulation materials have a short service life, which poses a safety risk during power system operation. To address this issue, a molecular model of polyethylene–montmorillonite (PE–MMT) nanocomposites is developed to simulate and explore the microscopic mechanisms influencing their breakdown characteristics. PE–MMT nanocomposites loaded with 0, 3.3, 4.0, or 5.1 wt% organically modified MMT are obtained via disordered doping. X-ray diffraction and scanning electron microscopy experimentally demonstrate the effects of modifying these nanofillers and dispersing them in PE, while radial distribution function, interaction energy, and fractional free volume studies reveal the microscale characteristics of the nanocomposites. Hydrogen bonds form in the PE–MMT nanocomposites, and the nanocomposite with 4.0 wt% nanofillers exhibits better breakdown properties than pure PE. The simulation results are in agreement with the data collected from experimental analogs, which confirms the accuracy and effectiveness of the PE–MMT nanocomposite models described herein. The findings of this study thus provide both a model for studying breakdown in PE and a modification procedure for improving PE as an insulating material.

更新日期：2022-06-07

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