Accelerated aging investigation of high voltage EPDM/silica composite insulators

Khattak, Abraiz; Amin, Muhammad

doi:10.1515/polyeng-2015-0004

Cited by 22 publications

(7 citation statements)

References 49 publications

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“…Among these data, the peak 1090 was the asymmetric stretching absorption peak, and the bending vibration of SiOSi occurred at 468 and 802 cm −1 . [ 26 ] The results indicated that SiO 2 has been coated onto the AP surface.…”

Section: Resultsmentioning

confidence: 99%

Effects of different supercritical temperatures on the modification of aramid pulp surface via coating silica to enhance the properties of EPDM composites

Kong

Ding

et al. 2020

Polymer Composites

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Poor dispersion is a major disadvantage of aramid pulp (AP) reinforced composites. In this study, nano-silica (SiO 2), as the surface modifier and reinforcing agent, was synthesized on AP surfaces to improve the dispersed character in ethylene-propylene-diene elastomer (EPDM) using supercritical carbon dioxide (scCO 2). The influence of the temperature of scCO 2 on treated AP, configuration of the surface, and mechanical performance of AP/EPDM composites were studied. Based on the results of Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy, SiO 2 was chemically grafted onto the AP surface. The SiO 2 nanoparticles were uniformly deposited on the AP surface, and the roughness of AP was increased based on the SEM results. The optimum temperature of the supercritical reaction was 100 C considering the results of all the tests. Under the optimum temperature and with 10 phr of AP, the mechanical properties, oil resistance, and dynamic mechanical properties of the SiO 2-AP/ EPDM composites were investigated. The tensile strength and tear strength of the SiO 2-AP/EPDM were improved by 121.1 and 134.9%, respectively, compared with that of the pure AP/EPDM composites. The fracture surface of the SiO 2-AP/EPDM composites showed that SiO 2-modified AP had a good dispersion in EPDM, and AP and EPDM had good interfacial bonding. Dynamic mechanical analysis results showed that the storage modulus of the composites was improved greatly compared with the pure AP/EPDM, and the loss factor also increased. The oil resistance of the composites was also improved.

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Section: Resultsmentioning

confidence: 99%

Effects of different supercritical temperatures on the modification of aramid pulp surface via coating silica to enhance the properties of EPDM composites

Kong

Ding

et al. 2020

Polymer Composites

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“…summer cycle which was of 11 days and winter cycle was 17 days. During summer cycle, temperature was kept 47.3°C and in winter cycle it was 35.2°C [7]. The specifications of accelerated weather cycles are shown in Table 2.…”

Section: Methodsmentioning

confidence: 99%

“…These stresses degrade the dielectric behaviour and increase the leakage current. One of the most effective methods to enhance properties of epoxy is the usage of epoxy nano and microcomposites in such applications [7,8]. Inorganic oxide type fillers have been proven very effective by several authors for enhancement of electrical properties of epoxy composites [9][10][11].…”

mentioning

confidence: 99%

Life estimation and investigation of dielectric strength of multistressed high‐voltage epoxy micro and nanocomposites

Amin

Khattak

Ali

2016

Micro & Nano Letters

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Epoxy/silica micro and nanocomposites are prepared and subjected to multiple accelerated stresses along with neat epoxy for 9000 h in a specially fabricated chamber. Leakage current measurements were recorded after each weather cycle. Dielectric strength was also evaluated according to ASTM-D149 after each 1000 h ageing. In the course of ageing time, neat epoxy was found with high dielectric loss and random rise in leakage current. In the case of both micro and nanocomposites, these properties indicated improvements over neat epoxy. By applying regression technique over leakage current measurements, relatively longer service lives of epoxy composites were estimated.

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“…The literature shows that by the addition of inorganic fillers, an increased dielectric constant with low heat dissipation can be achieved. For example, QiangHe et al studied the thermo oxidative and swelling behaviors of cerium oxide/SiR composites and discovered the enhanced thermal resistance of SiR and improved re-interlinking ability of chains [ 31 ]. In a study on electrical treeing, SiR incorporated with Si 3 N 4 and SiO 2 exhibited remarkable improvement [ 32 ].…”

Section: Introductionmentioning

confidence: 99%

Multi-Stressed Nano and Micro-Silica/Silicone Rubber Composites with Improved Dielectric and High-Voltage Insulation Properties

et al. 2021

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The scope of silicone rubber (SiR) is confined due to the deprivation of its dielectric propertiesupon exposure to various ambient stresses. The aim of this research is to develop silicone rubber-based composites by employing inorganic oxide fillers for improved dielectric and high voltage insulation properties for widening its scope in the field of electrical appliances. This study reports the preparation of different composites of silicone rubber with varying concentrations of micro and nano-silica fillers. The dielectric propertytrends of these as-prepared neat and impregnated samples were examined via an indigenously developed weathering chamber capable of applying multiple stresses of acid rain, heat, humidity, UVA radiation, and salt fog. Dielectric constant values were measured before and after applying stresses. Upon applying stresses, a periodic decline in dielectric constant was observed. Improved dielectric properties were obtained by adding micro and nano-silica as fillers. A nano silica-incorporated silicone rubber product exhibited good potential for dual applications as dielectric and high voltage insulation.

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Accelerated aging investigation of high voltage EPDM/silica composite insulators

Cited by 22 publications

References 49 publications

Effects of different supercritical temperatures on the modification of aramid pulp surface via coating silica to enhance the properties of EPDM composites

Effects of different supercritical temperatures on the modification of aramid pulp surface via coating silica to enhance the properties of EPDM composites

Life estimation and investigation of dielectric strength of multistressed high‐voltage epoxy micro and nanocomposites

Multi-Stressed Nano and Micro-Silica/Silicone Rubber Composites with Improved Dielectric and High-Voltage Insulation Properties

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