聚苯乙烯
硝化作用
介电常数
电介质
聚合物
高分子化学
取代基
化学
材料科学
偶极子
分析化学(期刊)
化学工程
复合材料
有机化学
光电子学
工程类
作者
Xinxuan Tang,Cuilian Din,Shiqi Yu,Yang Liu,Hang Luo,Dou Zhang,Sheng Chen
标识
DOI:10.1016/j.cej.2022.137281
摘要
It is a great challenge to achieve ultrahigh discharge energy density (Ue) via improving simultaneously permittivity and breakdown strength of polymer dielectrics. In this work, it is first found that nitrated polystyrene films possess excellent dielectric and energy storage properties. The mechanism for the permittivity and breakdown strength of nitrated polystyrene were investigated. On one hand, substituent group of dipolar nitro can increase the glass transition temperature and permittivity of polystyrene. On the other hand, nitro substituent group can not only construct charge traps to reduce the carrier mobility under high fields, but also effectively destroy the carrier channel formed by the accumulation of pi-pi between the benzene rings under high field, both which favor the enhancive breakdown strength of polystyrene. As a results, the maximum Ue of 6.32 J cm−3 at 640 MV m−1 was obtained in nitrated polystyrene with a substitution degree of 15%, which is 2.38 times than that of neat polystyrene. Furthermore, at 200 MV m−1 and 100 °C, nitrated polystyrene with a substitution degree of 66% produced Ue of 1.1 J cm−3 with 88% efficiency. This study demonstrates that the nitration can significantly promote permittivity and breakdown strength of polystyrene, and provides a guidance for preparing high-performance and large-scale polymer dielectrics.
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