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Silicone rubber composite insulators are often used in high-altitude environments, but the intense ultraviolet (UV) radiation in these areas can impact their reliability. Therefore, it is essential to study how silicone rubber materials age under UV irradiation. In this work, UV-B radiation for 1000 h was used to simulate the ageing process, and Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and Energy Dispersive Spectrometer (EDS) analysis were conducted for liquid silicone rubber. The results showed that under UV-B radiation, SiO2 particles appeared on the surface of the silicone rubber due to the crosslinking reactions about formation of Si-O-Si bonds. The methyl groups of the silicone rubber side chains were broken, due to chain scission reaction. Additionally, the ageing process was found to develop from the surface to the inside, and the intensity of UV ageing increases with time. This study offers a detailed analysis of the surface and depth variations of the microstructure in silicone rubber, which is essential for its use in high-voltage transmission lines.

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Change About Macro-Structure in Silicone Rubber Materials Under Strong UV Environment

  • 会议论文

  • 发表日期：

    2025年

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  • Pinlei Lyu,
  • Zhihang Xue,
  • Tao Cui,
  • Fenglian Liu,
  • Zongxi Zhang,
  • Chuanle Heng,
  • Kai Chen,
  • Ying Lin

摘要

Silicone rubber composite insulators are often used in high-altitude environments, but the intense ultraviolet (UV) radiation in these areas can impact their reliability. Therefore, it is essential to study how silicone rubber materials age under UV irradiation. In this work, UV-B radiation for 1000 h was used to simulate the ageing process, and Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and Energy Dispersive Spectrometer (EDS) analysis were conducted for liquid silicone rubber. The results showed that under UV-B radiation, SiO2 particles appeared on the surface of the silicone rubber due to the crosslinking reactions about formation of Si-O-Si bonds. The methyl groups of the silicone rubber side chains were broken, due to chain scission reaction. Additionally, the ageing process was found to develop from the surface to the inside, and the intensity of UV ageing increases with time. This study offers a detailed analysis of the surface and depth variations of the microstructure in silicone rubber, which is essential for its use in high-voltage transmission lines.