文献类型：期刊文献

英文题名：Construction of a flexible 1D core-shell Al2O3@NaNbO3 nanowire/poly(p-phenylene benzobisoxazole) nanocomposite with stable and enhanced dielectric properties in an ultra-wide temperature range

作者：Li, Jinpeng[1];Jiang, Junhao[1];Cheng, Qilin[1];Cui, Zhongkai[2];Liu, Xiaoyun[1];Zuo, Peiyuan[1];Zhuang, Qixin[1]

机构：[1]East China Univ Sci & Technol, Key Lab Adv Polymer Mat Shanghai, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China;[2]Southern Med Univ, Guangzhou 510515, Guangdong, Peoples R China

年份：2022

卷号：10

期号：2

起止页码：716

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY C

收录：;EI(收录号：20220311487627);WOS:【SCI-EXPANDED(收录号:WOS:000732016300001)】；

基金：This work was supported by the National Natural Science Foundation of China (52073091, 51773060, 22171086) and Key Laboratory of Advanced Polymer Materials of Shanghai.

语种：英文

外文关键词：Alumina - Aluminum oxide - Nanocomposites - Aspect ratio - Nanocomposite films - Dielectric materials - Dielectric losses - Dielectric properties of solids - Polymer films - Electric breakdown - Thermodynamic stability - Aromatic compounds - Niobium compounds

摘要：Polymeric dielectrics with high-temperature resilience are of critical importance in developing advanced electrostatic capacitors. Poly(p-phenylene benzobisoxazole) (PBO) is a polymer with excellent thermal stability. However, poor processability and low intrinsic dielectric constant restrict its application in high-performance dielectrics. In this study, PBO is synthesized by the precursor method, and the polymer films are prepared via solution casting which is more convenient than the traditional processing method. Moreover, a hierarchically structured one-dimensional Al2O3@NaNbO3 is designed and introduced into the PBO matrix. Due to the high aspect ratio and the unique structure of Al2O3@NaNbO3, the dielectric properties and breakdown strength of the nanocomposite have been substantially increased. The nanocomposite filled with 3 vol% Al2O3@NaNbO3 possesses the highest breakdown strength of 286 kV mm(-1) while maintaining a high dielectric constant of 6.68 and a low dielectric loss of 0.035 at 1 kHz, and the energy density increased to 1.64 J cm(-3) at 250 kV mm(-1) (approximate to 200% higher than that of pure PBO). In addition, the dielectric properties of 3 vol% Al2O3@NaNbO3-PBO exhibit excellent thermal stability from 25 to 250 degrees C which is attributed to the thermal resistance of both PBO and Al2O3@NaNbO3. This work provides a promising way to fabricate polymeric dielectrics for use in extreme environments.