Abstract
In this article, the nano-MgO particles were used as inorganic fillers, and polypropylene (PP) polymer was used as a matrix. The nano-MgO/PP composites were prepared by double melt blending. Using the polarization microscope (PLM) test and hot-stage microscope test, the crystalline morphology of PP and nano-MgO/PP with different mass fraction were observed. Using the differential scanning calorimetry (DSC) test, the parameters and crystallinity in the process of isothermal crystallization could be obtained. Additionally, the samples of pure PP and nano-MgO/PP composites were dealt with using a breakdown test and a dielectric frequency spectra test. From the experimental results, nano-MgO particle doping decreased the samples’ crystal size, and the crystalline structure was converted from large spherulites to fascicled crystallization. Additionally, the crystallization rate became fast and crystallinity increased. According to the breakdown test, the nano-MgO particle doping made the composites form small, dense spherulites. The breakdown developed through a longer path, so the composites’ breakdown strength rose greatly. When the mass fraction of nano-MgO particles was 3%, the shape parameter of the composites’ Weibull distribution β was larger, which illustrated that the nano-MgO particles were dispersed uniformly in the PP matrix. According to the dielectric frequency spectra test, the dielectric constant of different nanocomposites were all lower than which of pure PP, but the loss angle tangent values were all higher than which of pure PP.
Highlights
With the advancement of technology, the development trend of power transfer equipment to large-capacity and high-voltage and the demand for power system reliability have become higher and higher
Nano-MgO/PP composites with 1%, 3% and 5% particle mass fractions were prepared
The crystalline morphology and crystalline process of different composites were observed by polarization microscope (PLM) and differential scanning calorimetry (DSC) test
Summary
With the advancement of technology, the development trend of power transfer equipment to large-capacity and high-voltage and the demand for power system reliability have become higher and higher. A number of metal oxides were added into the polymers such as low-density polyethylene, epoxy resin and polypropylene With this nanoparticle doping, the matrix corona resistance and breakdown characteristics were significantly improved [15,16]. In all these studies, only a single experimental phenomenon was analyzed It requires a combination of material structures to explore the effect of nanoparticle doping on polymers’ dielectric properties. A series of research works were carried out on PP homopolymer, PP copolymer and PP nanocomposites, which attempted to improve the electrical properties of PP [23,24] Little of this literature was about the effect of nano-MgO particle doping on crystalline morphology and the breakdown characteristics of PP. The polypropylene material can be more extensively used in the field of high-voltage insulation
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