Improving the dielectric properties of polypropylene for metallised film capacitors based on cyclic olefin copolymer blending

IF 3.8 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC IET Nanodielectrics Pub Date : 2024-03-11 DOI:10.1049/nde2.12072
Meng Xiao, Mengdie Zhang, Boxue Du, Kailun Fan
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Abstract

High conductivity loss and low breakdown strength of traditional polypropylene (PP) film in the high-temperature environment are the key factors limiting the application of metallised film capacitors (MFCs). The effect of cyclic olefin copolymers (COCs) with different glass transition temperatures (Tgs) on the dielectric performance of PP/COC composites at high temperature are studied. The results showed that the addition of COC enhanced the intermolecular interaction force, which led to the reduction of defects in the films. In addition, COC with high Tg inhibits the movement of molecular chains and enhances the thermal stability of the film, which limits the transport of carriers at high temperatures. The conductivity and breakdown strength of the modified films (with a Tg of 134°C for COC) at 125°C are 91.6% lower and 45.7% higher, respectively, than that of pure PP. This method shows great potential in improving the dielectric properties of PP at high temperatures.

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基于环状烯烃共聚物混合物改善金属化薄膜电容器用聚丙烯的介电性能
传统聚丙烯(PP)薄膜在高温环境下的高电导损耗和低击穿强度是限制金属化薄膜电容器(MFC)应用的关键因素。研究了不同玻璃化转变温度(Tgs)的环烯烃共聚物(COC)对 PP/COC 复合材料高温下介电性能的影响。结果表明,COC 的加入增强了分子间的相互作用力,从而减少了薄膜中的缺陷。此外,高 Tg 的 COC 可抑制分子链的运动,增强薄膜的热稳定性,从而限制载流子在高温下的传输。改性薄膜(COC 的 Tg 为 134°C)在 125°C 时的导电率和击穿强度分别比纯 PP 低 91.6% 和高 45.7%。这种方法在改善 PP 在高温下的介电性能方面显示出巨大的潜力。
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来源期刊
IET Nanodielectrics
IET Nanodielectrics Materials Science-Materials Chemistry
CiteScore
5.60
自引率
3.70%
发文量
7
审稿时长
21 weeks
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