SURFACE TREATMENTS' EFFECTS ON THE CAPACITOR'S DIELECTRIC PERFORMANCE UNDER ELECTRO-THERMAL STRESSES

Authors

Haider. M. Umran, Electrical and Electronic Engineering Department, Faculty of Engineering, University of Kerbala, Karbala, IraqFollow
Feipeng Wang, State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Chongqing University, Chongqing, China

Abstract

Biaxial-oriented polypropylene (BOPP) films are characterized by unfavorable aging behavior because of their poor susceptibility to high temperatures, humidity, and high electric fields. This makes them unqualified to withstand harsh operating conditions, such as in capacitor applications. This study investigates the impact of annealing BOPP samples at 100 °C for five hours after fluorination at different times (15, 30, and 60 minutes) on their electrical and mechanical performance under electro-thermal stresses. Scanning electron microscope (SEM) images confirm that there is an increase in surface roughness and the formation of a dense layer of fluorine-containing groups monotonically with fluorination time. So, these roughness increases can probably change the electrical properties of the film. Based on the isothermal surface potential decay (ISPD) technique, the treated samples show slower surface potential decay than the original sample. Compared to 54% for the original sample, the surface potential remains at approximately 87.6% of its initial value after 7200 s. During aging, Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD) analysis revealed changes in the surface chemical composition and crystallinity development, respectively. The treated samples show improved aging behavior in terms of a lower dissipation factor and AC conductivity compared to the original sample. In the dynamic mechanical analysis (DMA), it was demonstrated that the strong polar bonding of C-F integrated into the polymer chain enhanced film mechanical performance.

Recommended Citation

Umran, Haider. M. and Wang, Feipeng (2024) "SURFACE TREATMENTS' EFFECTS ON THE CAPACITOR'S DIELECTRIC PERFORMANCE UNDER ELECTRO-THERMAL STRESSES," Karbala International Journal of Modern Science: Vol. 10 : Iss. 2 , Article 2.
Available at: https://doi.org/10.33640/2405-609X.3348

Creative Commons License

This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.