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The Research of Conductivity and Dielectric Properties of ZnO/LDPE Composites with Different Particles Size

1
Mechanical and Electrical Engineering Institute, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan 528400, China
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Mechanical and Electrical Engineering Institute, Zhongshan Polytechnic, Zhongshan 528400, China
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Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin 150080, China
*
Author to whom correspondence should be addressed.
Materials 2020, 13(18), 4136; https://doi.org/10.3390/ma13184136
Received: 4 August 2020 / Revised: 6 September 2020 / Accepted: 10 September 2020 / Published: 17 September 2020
Nanocomposites exhibit a high dielectric strength, whereas microcomposites exhibit a high thermal conductivity. In this study, good insulating materials were developed on the basis of the synergetic effect of micro- and nanoparticles, which were used as inorganic fillers. With a double-melting blend, nano-ZnO/low density polyethylene (LDPE), micro-ZnO/LDPE, and micro-nano-ZnO/LDPE composites were prepared, according to the scanning electron microscope test, polarization microscope test, conductivity test, breakdown test, and dielectric spectrum test, the dielectric property of micro-nano-ZnO/LDPE was explored. The SEM test results showed that by adding a suitable proportion of ZnO particles, the inorganic particles could disperse uniformly without reuniting. The PLM test results showed that the micro- and nano-ZnO particles adding decreased the crystal size. The arrangement was regular and tight. The macroscopic results showed that the mass fraction of nanoparticles and microparticles were 3% and 2%, the samples conductivity was the lowest. The breakdown field strength of the nanocomposites increased. The breakdown field strength of nanocomposites with 1%, 3%, and 5% nanoparticle contents were 5%, 15%, and 10% higher than that of pure LDPE. The addition of inorganic particles resulted in new polarization modes: Ionic displacement polarization and interfacial polarization. The ZnO/LDPE composites exhibited a higher dielectric constant and dielectric loss factor than pure LDPE. However, with the increasing frequency, it took considerable time to attain interfacial polarization in the nanocomposite and micro-nanocomposite, thus decreasing the dielectric constant. View Full-Text
Keywords: LDPE; dispersive; electrical conductivity; breakdown properties LDPE; dispersive; electrical conductivity; breakdown properties
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Cheng, Y.; Yu, G.; Yu, B.; Zhang, X. The Research of Conductivity and Dielectric Properties of ZnO/LDPE Composites with Different Particles Size. Materials 2020, 13, 4136.

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