结晶度
材料科学
针状的
结晶
聚丙烯
电介质
兴奋剂
复合材料
介电强度
电导率
电子工程
化学工程
微观结构
光电子学
化学
物理化学
工程类
作者
Z. Y. Ran,Boxue Du,Meng Xiao
出处
期刊:IEEE Transactions on Dielectrics and Electrical Insulation
[Institute of Electrical and Electronics Engineers]
日期:2021-10-01
卷期号:28 (5): 1547-1554
被引量:12
标识
DOI:10.1109/tdei.2021.009583
摘要
In this paper, a modification method of polypropylene (PP) films is proposed for capacitors by micro doping of carboxylated cellulose nanocrystals (C-CNCs). Results prove that crystallization process of films is promoted, due to the entanglement effect of acicular ultra-structures of C-CNCs on PP molecular chains. With a proper doping content (0.01 wt%), the thermal properties are elevated, and the DC conductivity decreases by raising crystallinity and limiting carrier movement. Modified films possess a restricted dielectric loss at low frequencies because of regular microstructures and decreased conduction loss. Based on DC experiments at different temperatures, the breakdown strength of C-CNC/PP films shows an increase by approximately 51% at 85 °C, basically equaled to the level of pure PP at 25 °C. The mechanism is attributed to deep trap sites, which are introduced by the large crystal region and result in short free path in carrier transport. This novel PP film shows a great potential for application under thermal-electrical compound field in power systems.
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