电工技术学报  2018, Vol. 33 Issue (23): 5591-5599    DOI: 10.19595/j.cnki.1000-6753.tces.171700
高电压与绝缘 |
纳米氧化石墨烯/环氧树脂复合材料的电极极化现象
张宏亮1,2,3,4, 金海1,3,4, 张丝钰2, 刘鹏2, 彭宗仁2
1. 兰州理工大学电气工程与信息工程学院 兰州 730050;
2. 电力设备电气绝缘国家重点实验室(西安交通大学) 西安 710049;
3. 甘肃省工业过程先进控制重点实验室 兰州 730050;
4. 兰州理工大学国家级电气与控制工程实验教学中心 兰州 730050
Electrode Polarization in Graphene Oxide/Epoxy Resins Nanocomposites
Zhang Hongliang1,2,3,4, Jin Hai1,3,4, Zhang Siyu2, Liu Peng2, Peng Zongren2
1. College of Electrical and Information Engineering Lanzhou University of Technology Lanzhou 730050 China;
2. State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong University Xi’an 710049 China;
3. Key Laboratory of Gansu Advanced Control for Industrial Processes Lanzhou 730050 China;
4. National Experimental Teaching Center of Electrical and Control Engineering Lanzhou University of Technology Lanzhou 730050 China
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摘要 以单层氧化石墨烯(GO)为填料,采用两相萃取法制备了纳米GO/环氧树脂(EP)复合材料和对照用纯EP试样。对GO在EP基体中的微观形貌进行了观测。测量了试样的玻璃化转变温度和空间电荷分布,发现直流电场下复合材料试样内部有明显的异极性电荷积聚。测量了复合材料及EP试样的宽频介电谱,发现复合材料在玻璃化转变温度以下会出现较明显的介电松弛现象。利用修正后的电极极化模型对复合材料的宽频介电谱数据进行了拟合分析,结果表明:低频区出现的介电松弛现象为电极极化造成的,产生电极极化的载流子主要来源于离子跳跃电导;温度达到80℃以上时,EP基体的直流电导率明显增大,其载流子主要来源于电子跳跃电导。
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关键词 氧化石墨烯环氧树脂纳米复合材料空间电荷电极极化    
Abstract:In this paper, the samples of graphene oxide/epoxy resins nanocomposites (GO/EP) were prepared by the method of two-phase extraction. For comparison purposes, the samples of pure epoxy resins (EP) were also prepared. Microscopic observation of graphene oxide in epoxy matrix was carried out by different microscopes. The glass transition temperatures Tg and space charge distributions of GO/EP and EP were measured, and obvious heterocharge accumulations were observed in the GO/EP sample bulk once a DC electric field had just been applied. By comparing the broadband dielectric spectrum of GO/EP and EP samples, a dielectric relaxation phenomenon appeared only in the GO/EP samples at temperatures no more than Tg. The dielectric spectrum of GO/EP were fitted and analyzed by using the modified electrode polarization model, which results show that: The dielectric relaxations in the low frequency region were caused by the electrode polarization, which were mainly generated by the ion jump conductance; At temperatures no less than 80℃, the DC conductivity in epoxy matrix were significantly increased, and the conductivity type was ohmic conductance, which carriers were mainly originated from the electronic jump conductance.
Key wordsGraphene oxide    epoxy resins    nanocomposites    space charge    electrode polarization   
收稿日期: 2017-12-14      出版日期: 2018-12-17
PACS: TM215.92  
基金资助:国家自然科学基金资助项目(51607082)
作者简介: 张宏亮 男,1983年生,博士研究生,讲师,研究方向为聚合物介电特性及空间电荷现象、高压电力设备绝缘结构优化设计。E-mail:zhanghl-518@foxmail.com(通信作者);金 海 男,1988年生,博士,讲师,研究方向为电磁场数值计算。E-mail:jinhai@hust.edu.cn
引用本文:   
张宏亮, 金海, 张丝钰, 刘鹏, 彭宗仁. 纳米氧化石墨烯/环氧树脂复合材料的电极极化现象[J]. 电工技术学报, 2018, 33(23): 5591-5599. Zhang Hongliang, Jin Hai, Zhang Siyu, Liu Peng, Peng Zongren. Electrode Polarization in Graphene Oxide/Epoxy Resins Nanocomposites. Transactions of China Electrotechnical Society, 2018, 33(23): 5591-5599.
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