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

IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2024-09-10 DOI:10.1109/TDEI.2024.3457534

Meng Xiao;Yuyan Chen;Haoliang Liu;Boxue Du

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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.

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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

高温下，金属化薄膜电容器用聚丙烯（PP）的介电性能显著下降，影响电容器的可靠工作。本文提出了一种基于电子束辐照改性提高PP薄膜高温介电性能的方法。制备了掺有季戊四醇三丙烯酸酯（PETA）的PP薄膜，并以0 ~ 20 kGy的剂量在EB射线下辐照。研究了辐照剂量、交联结构与PP薄膜介电性能之间的内在相关性。当交联度达到17.4%时，PP膜样品的介电强度提高最为显著。125℃时，PP15的直流击穿强度和电导率分别为561 kV/mm和1.12\ × 10^{-{13}}$。放电能量密度为2.96 J/cm3，充放电效率为75.0%。结果表明，聚丙烯薄膜的刚性结构在高温下阻碍了分子链的弯曲和滑动，提高了聚丙烯薄膜的耐热性。本研究表明，辐照交联改性的应用改善了聚丙烯薄膜的介电性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

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.