Abstract
In this article, the melting blend was used to prepare the Micro-ZnO/LDPE, Nano-ZnO/LDPE and Micro-Nano-ZnO/LDPE with different inorganic particles contents. The effect of Micro-ZnO and Nano-ZnO particles doping on interface microdomain and corona-resistance breakdown characteristics of LDPE composite could be explored. Based on the energy transfer and heat exchange theory of energetic electrons, the inner electrons energy transfer model of different ZnO/LDPE composites was built. Besides, the microstructure and crystalline morphology of inorganic ZnO-particles and polymer composites were detected by SEM, XRD, FTIR, PLM and DSC test, and the AC breakdown and corona-resistance breakdown characteristics of composites could be explored. From the experimental results, the Nano-ZnO particles after surface modification dispersed uniformly in LDPE matrix, and the nanoparticles agglomeration almost disappeared. The inorganic particles doping acted as the heterogeneous nucleation agent, which improved the crystallization rate and crystallinity of polymer composites effectively. The ZnO particles with different size doping constituted the different interface structure and crystalline morphology, which made different influence on composites macroscopic properties. When the Nano-ZnO particle size was 40nm and the mass fraction was 3%, the breakdown field strength of Nano-ZnO/LPDE was the highest and 15.8% higher than which of pure LDPE. At the same time, the shape parameter β of Micro-Nano-composite was the largest. It illustrated the microparticles doping reduced the probability of nanoparticles agglomeration in matrix. Besides, both Micro-ZnO and Micro-Nano-ZnO particles doping could improve the ability of corona corrosion resistance of LDPE in varying degrees. The corona-resistant breakdown time order of four samples was as follows: LDPE < Micro-ZnO/LDPE < Nano-ZnO/LDPE < Micro-Nano-ZnO/LDPE. When the mass fraction of Micro-ZnO and Nano-ZnO particles was 2% and 3% respectively, the corrosion depth and area of Micro-Nano-ZnO/LDPE was the least, and the ability of corona corrosion resistance was the strongest.
Highlights
As the modern power system developed, the higher requirements on load and stress level of electrical insulation was put forward
In order to further discuss the effect of Micro-ZnO and Nano-ZnO particles doping to dielectric properties of LDPE, after the pretreatment, the samples LDPE, N5, N3M2 and M5 were placed in composite was larger than that of Nano-composite
In order to further discuss the effect of Micro-ZnO and Nano-ZnO particles doping to dielectric properties of LDPE, after the pretreatment, the samples LDPE, N5, N3M2 and M5 were placed in needle-plane electrode system for corona-resistant breakdown test
Summary
As the modern power system developed, the higher requirements on load and stress level of electrical insulation was put forward. The inorganic Nanophase would form the quasi-homogeneous phase structure in polymer matrix, for another it could absorb and consume the energy of energetic particles produced by discharge according to the interface effect of inorganic microparticles and nanoparticles. It could improve the long-term dielectric properties and operation life. According to the corona-resistance breakdown test combining with some microstructure characterization techniques such as SEM, XRD, FTIR, PLM and DSC, the relationship between interface microdomain morphology and properties of polymer/inorganic. The effect of different sized ZnO particles doping on dielectric strength of LDPE was explored
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