Crystallization of high temperature vulcanized silicone rubber: Effect of ATH concentration

2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2020-10-18 DOI:10.1109/CEIDP49254.2020.9437561

Yuhao Liu, Yingfei Lin, Kangning Wu, Liming Wang

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引用次数: 1

Abstract

High temperature vulcanized silicone rubber (HTVSR) insulators have been widely used on transmission lines. To improve the tracking and erosion resistance and flame retardant of HTVSR, a great of amount of aluminium hydroxide (ATH) is added. It inevitably influences the crystallization characteristics which are important since HTVSR insulators operate below the crystallization temperature. In this paper, to analyze influence of ATH on crystallization of HTVSR, differential scanning calorimeter (DSC), polarized optical microscopy (POM), and broadband dielectric spectroscopy (BDS) were used. A complete crystallization process has been observed by POM. DSC showed that ATH accelerated the crystallization and improved the melting temperature, which meaned that stability of crystal was enhanced. From the isochronal plot of dielectric permittivity, it was found that, with increase of ATH, the temperature of glass transition was lower and the temperature range during glass transition became wider, which indicated that ATH increased the cooperative rearrangement and inhomogeneity in amorphous region. These indicated that two phases (crystal and amorphous region) were more distinct due to ATH.

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高温硫化硅橡胶结晶:ATH浓度的影响

高温硫化硅橡胶(HTVSR)绝缘子在输电线路上得到了广泛应用。为提高HTVSR的抗跟踪性、抗冲蚀性和阻燃性，加入了大量的氢氧化铝(ATH)。它不可避免地影响结晶特性，这是重要的，因为HTVSR绝缘子工作在结晶温度以下。本文采用差示扫描量热仪(DSC)、偏光显微镜(POM)和宽带介电光谱(BDS)分析ATH对HTVSR结晶的影响。用POM观察到完整的结晶过程。DSC结果表明，ATH加速了结晶，提高了熔融温度，提高了晶体的稳定性。从介质介电常数等时图中可以发现，随着ATH的增加，玻璃化转变温度降低，玻璃化转变温度范围变宽，表明ATH增加了非晶区的协同重排和非均匀性。这表明，由于ATH的作用，两相(晶区和非晶区)更加明显。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

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