Home Journals Articles Updates About
CN
image
收藏切换
Influence of thermal ageing on electric strength of epoxy/glass fiber composites
收藏切换
PDF
Jian ZHANG1, Pengfei WANG2, Zhongyuan LI1, Ji LIU2, Heqian LIU1, Hongda YANG1
Insulating Materials | 2025, 58(7) : 121 - 128
Less
收藏切换
Insulating Materials | 2025, 58(7): 121-128
• Insulation Technology •
Influence of thermal ageing on electric strength of epoxy/glass fiber composites
Full
Jian ZHANG1, Pengfei WANG2, Zhongyuan LI1, Ji LIU2, Heqian LIU1, Hongda YANG1
Affiliations
  • 1. Electric Power Research Institute, State Grid Heilongjiang Electric Power Company Limited, Harbin 150030, China
  • 2. Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin 150080, China
Published: 2025-07-20 doi: 10.16790/j.cnki.1009-9239.im.2025.07.014
Outline
收藏切换

To investigate the thermal ageing mechanism of dry air core reactor encapsulated insulating materials at the molecular level, this study conducted 336-hour accelerated thermal ageing tests on epoxy/glass fiber composites at 180℃. The evolutionary characteristics of functional groups, molecular chain segment motions, activation energies, and AC electric strength of the epoxy/glass fiber composites after ageing were characterized by infrared spectroscopy, dielectric spectroscopy, and AC electric strength test. The effect of the decrease in activation energy caused by the changes in chemical structure and the evolution of molecular chain segment movement properties during ageing on the AC electric strength was investigated. The results show that a lot of carbonyl groups and small molecular chains dominated by ester and ketone groups generate during the ageing process. These small molecule chains and polar groups greatly increase the free volume and the number of free electrons inside the epoxy matrix, so that the chain segment movement is gradually enhanced and the activation energy is reduced, which ultimately leads to a significant reduction in insulation capacity.

dry air core reactor  /  epoxy/glass fiber composites  /  thermal ageing  /  activate energy
Jian ZHANG, Pengfei WANG, Zhongyuan LI, Ji LIU, Heqian LIU, Hongda YANG. Influence of thermal ageing on electric strength of epoxy/glass fiber composites[J]. Insulating Materials, 2025 , 58 (7) : 121 -128 . DOI: 10.16790/j.cnki.1009-9239.im.2025.07.014
Appendix
Less
Year 2025 volume 58 Issue 7
PDF
268
123
Cite this Article
BibTeX
Article Info
doi: 10.16790/j.cnki.1009-9239.im.2025.07.014
  • Receive Date：2024-08-04
  • Online Date：2025-10-29
  • Published：2025-07-20
Article Data
Affiliations
History
  • Received：2024-08-04
  • Revised：2024-10-23
Funding
Affiliations
    1. Electric Power Research Institute, State Grid Heilongjiang Electric Power Company Limited, Harbin 150030, China
    2. Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin 150080, China
References
Share
https://castjournals.cast.org.cn/joweb/jycl/EN/10.16790/j.cnki.1009-9239.im.2025.07.014
Share to
QR

Scan QR to access full text

Cite this article
BibTeX
Citations
表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
关闭全屏
  • BibTeX
  • EndNote
  • RefWorks
  • TxT
Links
Articles
Latest Articles
Most Read
Collections
Updates
Events
News
Multimedia
About
About Us
Contact
No. 86 Xueyuan South Road, Haidian District, Beijing
100081
010-62199257
qkjq@cast.org.cn

Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House