Enhanced Electrical Tree Resistance of Voltage Stabilizer Grafted Epoxy Resin Under Coupled High-Frequency and High-Temperature Stress
Year: 2026
Type: conference-paper
Abstract: The polymer insulation encapsulating high-frequency transformers is susceptible to premature failure from electrical treeing under severe coupled electro-thermal stresses. This study addresses this challenge by enhancing the electrical treeing resistance of a bisphenol-A epoxy resin (DGEBA) through the chemical grafting of 1,4-diaminoanthraquinone (DAAQ). DAAQ-g-DGEBA composites were synthesized and their tree growth was systematically evaluated under simultaneous 10 kHz and 90 °C stress using a multi-method approach encompassing physicochemical, electrical, trap-property, and molecular dynamics analyses. Results show that DAAQ grafting introduces shallow traps and increases trap density, effectively delaying tree initiation, retarding propagation, and transforming the morphology from dendritic to a dense, bush-like pattern. Furthermore, molecular simulations reveal that the grafted composite possesses a higher fractional free volume, facilitating charge migration and mitigating molecular chain damage. This work elucidates the dual inhibition mechanisms-shallow-trap engineering and free-volume modulation-underlying the enhanced performance, providing critical insights for designing next-generation encapsulation materials capable of withstanding harsh, high-frequency power applications.
Institution: Fuzhou University
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W7222425678