文章摘要
Effect of Relative Molecular Weights of Silicone Rubber on Aging Properties of Silicone Rubber Materials for Composite Insulators
Received:July 10, 2024  Revised:July 10, 2024
DOI：10.12136/j.issn.1000-890X.2026.07.0497
Key Words: relative molecular weight；composite insulator；silicone rubber；multi-factor aging
Author NameAffiliationE-mail
SUN Yecheng Yangzhou University mz120220701@stu.yzu.edu.cn 
TIAN Yao Yangzhou University  
LI Chao Yangzhou ShuangBao Electric Equipment Co.,Ltd.  
MA Gang Yangzhou ShuangBao Electric Equipment Co.,Ltd.  
LU Yuhe Yangzhou University  
TIAN Shaoyang Yangzhou University  
LIU Junliang* Yangzhou University liujunliang@yzu.edu.cn 
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Abstract:
      The effect of relative molecular weights of methy vinyl silicone rubber（VMQ） on thermal oxygen-high humidity-ultraviolet multi-factor aging properties of VMQ materials for composite insulators was studied.The results showed that in the range of weight average molecular weight of 459 000 to 765 000，the higher molecular weight VMQ material had stronger rubber matrix-filler interaction，the filler was not easily detached after VMQ material aging，and the degradation of surface morphology and the decrease in tensile properties were slower.The aging time for complete pulverization of VMQ material with a weight average relative molecular weight of about 765 000 was delayed about 240 h compared to VMQ material with a weight average relative molecular weight of about 459 000，and after its aging，the performance retention rate of characteristic groups of VMQ molecule was the highest，the performance retention rate of —Si—O—Si— skeleton group was about 43.7%，the performance retention rate of —Si—CH3 hydrophobic side group was at about 21.9%.
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