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
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.
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2018, Vol. 33 
