Improved Dielectric Properties of Polypropylene Films by Electron-Beam Irradiation Modification for Power Capacitor

IF 2.9 3区 工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC
Meng Xiao;Yuyan Chen;Haoliang Liu;Boxue Du
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引用次数: 0

Abstract

The dielectric properties of polypropylene (PP) for metalized film capacitors (MFCs) decrease significantly at high temperatures, affecting the reliable operation of capacitors. In this article, a method of improving the high-temperature dielectric properties of PP films based on electron-beam (EB) irradiation modification is proposed. PP films doped with pentaerythritol triacrylate (PETA) are prepared and irradiated with doses of 0–20 kGy under EB rays. The intrinsic correlation among the irradiation dose, crosslinking structure, and the dielectric properties of PP films is investigated. The improvement in dielectric strength is most significant for the PP film samples with a crosslinking degree of up to 17.4%. The dc breakdown strength and conductivity of PP15 are 561 kV/mm and $1.12\times 10^{-{13}}$ at 125° C, respectively. The discharged energy density is 2.96 J/cm3 with the charge-discharge efficiency of 75.0%. The results show that the rigid structure impedes the bending and slipping of molecular chains at high temperatures, improving the heat resistance of PP. This study illustrates that the application of irradiation crosslinking modification improves the dielectric properties of PP films.
通过电子束辐照改性提高聚丙烯薄膜的介电性能,用于功率电容器
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来源期刊
IEEE Transactions on Dielectrics and Electrical Insulation
IEEE Transactions on Dielectrics and Electrical Insulation 工程技术-工程:电子与电气
CiteScore
6.00
自引率
22.60%
发文量
309
审稿时长
5.2 months
期刊介绍: Topics that are concerned with dielectric phenomena and measurements, with development and characterization of gaseous, vacuum, liquid and solid electrical insulating materials and systems; and with utilization of these materials in circuits and systems under condition of use.
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