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Open AccessArticle

Space Charge Characteristics and Electrical Properties of Micro-Nano ZnO/LDPE Composites

1
Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, School of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin 150080, China
2
Xinya Electronic co., Ltd., Wenzhou 325603, China
*
Author to whom correspondence should be addressed.
Crystals 2019, 9(9), 481; https://doi.org/10.3390/cryst9090481
Received: 31 July 2019 / Revised: 7 September 2019 / Accepted: 11 September 2019 / Published: 14 September 2019
(This article belongs to the Special Issue Mesocrystals in Energy Applications)
The synergistic effects of zinc oxide (ZnO) Micro/Nano particles simultaneously filled in low-density polyethylene (LDPE) on the space charge characteristics and electrical properties has been investigated by melt blending micro-scale and nanoscale ZnO additive particles into LDPE matrix to prepare Micro-ZnO, Nano-ZnO, and Micro-Nano ZnO/LDPE composites. The morphological structures of composite samples are characterized by Polarizing Light Microscopy (PLM), and the space charge accumulations and insulation performances are correlated in the analyses with Pulse Electronic Acoustic (PEA), DC breakdown field strength, and conductance tests. It is indicated that both the micro and nano ZnO fillers can introduce plenty of heterogeneous nuclei into the LDPE matrix so as to impede the LDPE spherocrystal growth and regularize the crystalline grains in neatly-arranged morphology. By filling microparticles together with nanoparticles of ZnO additives, the space charge accumulations are significantly inhibited under an applied DC voltage and the minimum initial residual charges with the slowest charge decaying rate have been achieved after an electrode short connection. While the micro-nano ZnO/LDPE composites acquire the lowest conductivity, the breakdown strengths of the ZnO/LDPE nanocomposite and micro-nano composite are, respectively, 13.7% and 3.4% higher than that of the neat LDPE material. View Full-Text
Keywords: polyethylene; micro-nano composite; space charge; DC breakdown strength polyethylene; micro-nano composite; space charge; DC breakdown strength
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MDPI and ACS Style

Gao, J.-G.; Li, X.; Yang, W.-H.; Zhang, X.-H. Space Charge Characteristics and Electrical Properties of Micro-Nano ZnO/LDPE Composites. Crystals 2019, 9, 481.

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