https://doi.org/10.1140/epjs/s11734-025-01845-z
Regular Article
Influence of baking on the properties of modified E-51 epoxy resin for cryogenic insulation and superconducting application
1
Yunnan Power Grid Corporation, 650217, Kunming, Yunnan, China
2
College of Electric Power Engineering, Kunming University of Science and Technology, 650500, Kunming, Yunnan, China
a
This email address is being protected from spambots. You need JavaScript enabled to view it.
Received:
30
July
2024
Accepted:
4
August
2025
Published online:
18
August
2025
The modified epoxy resin aims at absorbing internal stress at cryogenic temperatures; it plays an important role in fabricating mechanical or insulating structural components. As a result, a modified E-51 epoxy resin system for cryogenic insulation and superconducting application was developed to investigate the impact of baking temperature and baking time on the evolution of micro-structure, thermostability, mechanical properties, and dielectric properties. Infrared spectrum tests reveal that the test specimens will undergo further decomposition if baking temperature reaches 185 °C, while the micro-structure observations reveal the modified E-51 epoxy resin system has a stable micro-structure after undergoing 50 thermal cycling and subsequent baking at 105 °C for 120 h. However, continuous baking at 105 °C can lead to the epoxy resin undergoing secondary curing, corresponding to the free radicals inside the material decreasing, while the ultimate tensile strength compared with the test specimens without baking undergoes a decline of approximately 29.62% when they are baked for 240 h. Moreover, further baking the modified E-51 epoxy resin system for 480 h can lead to significant changes in the micro-structure. In addition, the hardness values increased when the test specimens were baked at 105 °C for 0–480 h, but the dielectric constant values initially increased and then decreased. Therefore, working temperature control of the modified E-51 epoxy resin system is critical.
Copyright comment Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
© The Author(s), under exclusive licence to EDP Sciences, Springer-Verlag GmbH Germany, part of Springer Nature 2025
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
