Abstract
Epoxy resin is widely employed as a polymeric insulation material. Epoxy/amine resin is a type of resin that is crosslinked by amine groups, exhibiting improved mechanical properties, better durability, and easier curing process. However thermal degradation is a concern as the polymeric insulation material is prone to heat accumulation during long-term use. Thus, this study aims to investigate the effects of thermal aging on the mechanical and dielectric properties of epoxy/amine resin, along with the associated molecule change. Specimens were prepared and thermally aged at 105 ℃ for durations ranging from 0 hours to 1000 hours. Tensile strength, electrical tree growth, dielectric constant and loss were measured to assess the impact of thermal aging. ATR-FTIR (Attenuated total reflectance Fourier-transform infrared) and UV-Vis (Ultraviolet-visible) spectrometers were utilized to analyze the relationship between property changes and chemical structure. With increased aging time, tensile strength initially rose and then fell, which can be attributed to the formation and subsequent degradation of ether bonds in the surface layer of epoxy/amine resin. The consistent chain scission and oxidation were also observed in the specimen surface. Notably, a heterogeneous degradation was found to appear from the sample surface to the core, with nearly no degradation in the core of the specimen After almost 1000 hours of aging. Moreover, a higher crosslinking degree was observed inside the aged specimen than the unaged one, leading to a higher electrical tree initiation voltage. This spatial inhomogeneity of thermal degradation provides a compelling explanation to the diverse effects of thermal aging on mechanical and electrical properties.
| Original language | English |
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| Title of host publication | Proceedings of 2023 International Symposium on Electrical Insulating Materials, ISEIM 2023 |
| Publisher | Institute of Electrical Engineers of Japan |
| Pages | 30-33 |
| Number of pages | 4 |
| ISBN (Electronic) | 9784886864376 |
| Publication status | Published - 2023 |
| Externally published | Yes |
| Event | 2023 International Symposium on Electrical Insulating Materials, ISEIM 2023 - Matsue City, Japan Duration: Sept 24 2023 → Sept 28 2023 |
Publication series
| Name | Proceedings of the International Symposium on Electrical Insulating Materials |
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Conference
| Conference | 2023 International Symposium on Electrical Insulating Materials, ISEIM 2023 |
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| Country/Territory | Japan |
| City | Matsue City |
| Period | 9/24/23 → 9/28/23 |
Bibliographical note
Publisher Copyright:© 2023 The Institute of Electrical Engineers of Japan.
ASJC Scopus Subject Areas
- Electrical and Electronic Engineering
- Electronic, Optical and Magnetic Materials
Keywords
- chemical structure
- dielectric properties
- epoxy resin
- mechanical properties
- thermal aging