电介质
材料科学
聚合物
偶极子
介电损耗
高-κ电介质
玻璃化转变
热稳定性
纳米结构
化学物理
光电子学
凝聚态物理
纳米技术
复合材料
化学工程
有机化学
化学
物理
工程类
作者
Yash Thakur,Rui Dong,Minren Lin,Shan Wu,Zhaoxi Cheng,Ying Hou,J. Bernholc,Qi Zhang
出处
期刊:Nano Energy
[Elsevier BV]
日期:2015-07-02
卷期号:16: 227-234
被引量:50
标识
DOI:10.1016/j.nanoen.2015.06.021
摘要
Advances in modern electronics require the development of polymer-based dielectric materials with high dielectric constant, low dielectric loss, and high thermal stability. Fundamental dielectric theory suggests that strongly dipolar polymers have the potential to realize a high dielectric constant. In order to achieve high thermal stability, these polymers should also possess a high glass transition temperature Tg. However, it has been observed that in many dielectric polymers the dielectric constant decreases markedly at temperatures below Tg due to dipole freezing. This study shows, through combined theoretical and experimental investigations, that nano-structure engineering of a weakly-coupled strongly-dipolar polymer can result in a high energy density polymer with low loss and high operating temperature. Our studies reveal that disorder creates a significantly larger free volume at temperatures far below Tg, enabling easier reorientation of dipoles in response to an electric field in aromatic urea and thiourea polymers. The net result is a substantial enhancement in the dielectric constant while preserving low dielectric loss and very high breakdown field. These results here pave the way for engineering the nanostructure to create high energy density polymers with low loss and high operating temperature.
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