电工技术学报  2018, Vol. 33 Issue (22): 5159-5167    DOI: 10.19595/j.cnki.1000-6753.tces.L80834
直流管道输电绝缘关键技术专题(Ⅱ)(特约主编:李庆民教授 马国明副教授) |
碳纳米管对环氧树脂复合介质电-热裂解特性的微观调控模拟
倪潇茹1, 王健1, 王靖瑞1, 李庆民1, 韩智云2
1. 新能源电力系统国家重点实验室(华北电力大学) 北京 102206;
2. 山东大学电气工程学院 济南 250061
Micro-Control Simulation of Electro-Thermal Dissociation Characteristics of Carbon Nanotubes/Epoxy Resin Composites
Ni Xiaoru1, Wang Jian1, Wang Jingrui1, Li Qingmin1, Han Zhiyun2
1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China;
2. School of Electrical Engineering Shandong University Jinan 250061 China
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摘要 环氧树脂的老化裂解是影响直流气体绝缘金属封闭输电线路(GIL)设备安全运行的重要因素之一,通过添加一定质量分数的纳米粒子可有效调控其耐热性能。本文建立了四种交联环氧树脂模型,包括纯环氧树脂模型,以及未封端、半封端和全封端的碳纳米管/环氧树脂复合介质模型。基于反应力场ReaxFF,利用LAMMPS软件对四种介质模型开展电-热裂解的反应分子动力学模拟。结果表明,在裂解过程中,碳纳米管/环氧树脂复合介质模型的初始裂解温度均提高,其归一化分子数降低了约15%,裂解产生的小分子产物的数量和种类也有所减少。电-热裂解过程中温度占主导作用,主要发生的是热裂解,电应力的存在则造成各极性分子和基团沿电场方向运动。碳纳米管在一定程度上改善了环氧树脂的热稳定性,缓解了其电-热老化过程,其中未封端和半封端碳纳米管复合介质模型的效果更为显著,这为环氧树脂复合介质的微观调控提供辅助设计手段。
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倪潇茹
王健
王靖瑞
李庆民
韩智云
关键词 环氧树脂碳纳米管电-热裂解微观调控反应分子动力学模拟    
Abstract:The aging and dissociation of epoxy resin is one of the important factors affecting the safe operation of DC GIL equipment. Adding a certain mass fraction of nanoparticles can effectively regulate its thermal performance. Four crosslinked epoxy resin models have been established in this paper, including pure epoxy resin, non-capped, half-capped, and fully capped carbon nanotube/epoxy composite media models. Based on the reaction force field ReaxFF, reaction molecular dynamics simulations of electron-thermal dissociation were performed on the four media models using the LAMMPS software. The results show that during the dissociation process, the initial dissociation temperature of the carbon nanotube/epoxy composite medium model is increased, the number of normalized molecules is reduced by about 15%, and the number and type of small molecule products produced also are decreased. During the electron-thermal dissociation process, the temperature dominates, thermal dissociation mainly occurs. The presence of electrical stress causes polar molecules and groups to move in the direction of the electric field. Carbon nanotubes improve the thermal stability of the epoxy resin to a certain extent, and alleviate the electro-thermal aging process. The effect of the non-capped and half-capped carbon nanotube composite medium models is more significant, which can provide an auxiliary design method for the micro-control of epoxy composite media.
Key wordsEpoxy resin    carbon nanotube    electro-thermal dissociation    micro-control    reactive molecular dynamics simulation   
收稿日期: 2018-05-28      出版日期: 2018-11-27
PACS: TM215.92  
基金资助:国家自然科学基金(51737005),北京市自然科学基金(3172035)和中央高校基本科研业务费专项资金(2018MS165)资助项目
通讯作者: 李庆民 男,1968年生,教授,博士生导师,主要从事新型特高压直流输变电装备与绝缘技术的研究工作。E-mail: lqmeee@ncepu.edu.cn   
作者简介: 倪潇茹 女,1994年生,硕士研究生,主要从事纳米掺杂的环氧树脂复合材料的性能研究工作。E-mail: nixiaoru12@163.com
引用本文:   
倪潇茹, 王健, 王靖瑞, 李庆民, 韩智云. 碳纳米管对环氧树脂复合介质电-热裂解特性的微观调控模拟[J]. 电工技术学报, 2018, 33(22): 5159-5167. Ni Xiaoru, Wang Jian, Wang Jingrui, Li Qingmin, Han Zhiyun. Micro-Control Simulation of Electro-Thermal Dissociation Characteristics of Carbon Nanotubes/Epoxy Resin Composites. Transactions of China Electrotechnical Society, 2018, 33(22): 5159-5167.
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