Abstract
In high-voltage insulation systems, the most commonly used material is polymeric material because of its high dielectric strength, high resistivity, and low dielectric loss in addition to good chemical and mechanical properties. In this work, various polymer compounds were prepared, consisting of low-density polyethylene (LDPE), high-density polyethylene (HDPE), polypropylene (PP), HDPE/PP, and LDPE/PP polymer blends. The relative permittivity and breakdown strength of each sample types were evaluated. In order to determine the physical properties of the prepared samples, the samples were also characterized using differential scanning calorimetry (DSC). The results showed that the dielectric constant of PP increased with the increase of HDPE and LDPE content. The breakdown measurement data for all samples were analyzed using the cumulative probability plot of Weibull distribution. From the acquired results, it was found that the dielectric strengths of LDPE and HDPE were higher than that of PP. Consequently, the addition of LDPE and HDPE to PP increased the breakdown strength of PP, but a variation in the weight ratio (30%, 50% and 70%) did not change significantly the breakdown strength. The DSC measurements showed two exothermic crystallization peaks representing two crystalline phases. In addition, the DSC results showed that the blended samples were physically bonded, and no co-crystallization occurred in the produced blends.
Highlights
Thermoplastic polymers, such as polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), and polystyrene (PS) are the main products of industrial engineering, which are employed in several electrical application fields
Breakdown strength measurements of polymer compounds were successfully performed to investigate the impact of synthesis polymers on their dielectric properties
Impedance measurements as a function of frequency and the average degree of crystallinity taken from differential scanning calorimetry (DSC) measurements were successfully determined to characterize the low-density polyethylene (LDPE)/PP
Summary
Thermoplastic polymers, such as polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), and polystyrene (PS) are the main products of industrial engineering, which are employed in several electrical application fields. In high-voltage equipment, polymers are commonly used in the insulation systems because of their exceptional mechanical, electrical, chemical, and thermal properties and their low production cost. In insulation materials, which are produced by mixing different polymers at different weight ratios, polymers are used to modify the physical and mechanical properties of the final products, maintaining a lower production cost. High-density polyethylene (HDPE), low-density polyethylene (LDPE), and PP are the most widely used polymers in the world market, employed for electrical equipment, automotive engineering material, and packaging. The weak properties of LDPE include a lack of mechanical and thermal resistance. Numerous researchers are working on improving the properties of LDPE by mixing it with other polymers that have high temperature resistance [2,3]
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