文献类型：期刊文献

英文题名：Covalently modified and hierarchically structured corn-like BNNs@BT/benzoxazole composites with enhanced dielectric properties over an ultra-wide temperature range

作者：Wang, Xinhua[1];Yuan, You[1];Zhang, Yantai[1];Qian, Jun[1];Zuo, Peiyuan[1];Liu, Xiaoyun[1];Zhuang, Qixin[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Special Funct Polymer Mat & Related Techno, Minist Educ, Shanghai 200237, Peoples R China

年份：2022

卷号：160

外文期刊名：COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING

收录：;EI(收录号：20222512249994);WOS:【SCI-EXPANDED(收录号:WOS:000816913700001)】；

基金：Acknowledgement This work was supported by the National Natural Science Foundation of China (52073091, 22171086) , Natural Science Foundation of Shanghai (20ZR1414600) and the Fundamental Research Funds for the Central Universities (JKD01221632) .

语种：英文

外文关键词：Hybrid; Polymer-matrix composites (PMCs); Electrical properties; High-temperature properties

摘要：Polymer dielectric material is widely used in pulsed power technology and high-energy weapon systems. However, enhanced dielectric constant of polymer is accompanied by suppressed breakdown strength with the addition of dielectric ceramic. Herein, we report an efficient method to prepare functional corn-like hybrids which consist of BaTiO3 nanowires (BT) and BNNs nanosheets based on surface modification and high temperature ceramization. It is demonstrated that the outer BNNs not only optimizes the intrinsic dielectric difference matching, but also effectively suppress the loss caused by carrier migration. Especially, an increasement for operating temperature is achieved with the help of the poly-p-phenylene benzobisoxazole (PBO). Under 4 wt % filling, the composites have the highest discharged energy density (U-d = 2.24 J cm(-3)). Meanwhile, it also has high charge and discharge efficiency (eta = 85 %) and an ultra-wide temperature dielectric stability (25 ?-200 ?). This work provides a promising dielectric nanocomposite candidate for high temperatures applications.