文献类型：期刊文献

英文题名：Optimizing nanostructure to achieve high dielectric response with low loss in strongly dipolar polymers

作者：Thakur, Yash[1,2];Dong, Rui[3];Lin, Minren[1,2];Wu, Shan[1,2];Cheng, Zhaoxi[1,2,4];Hou, Ying[1,2,5];Bernholc, J.[3];Zhang, Q. M.[1,2]

机构：[1]Penn State Univ, Dept Elect Engn, University Pk, PA 16802 USA;[2]Penn State Univ, Mat Res Inst, University Pk, PA 16802 USA;[3]N Carolina State Univ, Ctr High Performance Simulat, Raleigh, NC 27695 USA;[4]Nanjing Univ, Dept Polymer Sci & Engn, Sch Chem & Chem Engn, Nanjing 210093, Jiangsu, Peoples R China;[5]E China Univ Sci & Technol, Dept Phys, Shanghai 200237, Peoples R China

年份：2015

卷号：16

起止页码：227

外文期刊名：NANO ENERGY

收录：;EI(收录号：20152901038933);WOS:【SCI-EXPANDED(收录号:WOS:000364579300024)】；

基金：The authors thank the support of this work by ONR under Grants nos. N00014-14-1-0109, N00014-14-1-0106 and N00014-13-1-0719.

语种：英文

外文关键词：Nano-dielectrics; Energy storage; Free-volume effect; High thermal stability

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 T-g. 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 T-g, 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. (C) 2015 Elsevier Ltd. All rights reserved.