文献类型：期刊文献

英文题名：The poly (arylene ether urea) double interface layer formed in PEEU@HfO2/PEI nanocomposites enables enhanced dielectric and energy storage performance

作者：Lin, Jingyu[1];Wu, Xiaohan[1];Xia, Yifan[1];Nie, Lingzhi[1];Zuo, Peiyuan[1];Mi, Puke[1];Zhuang, Qixin[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Adv Polymer Mat Shanghai, Shanghai 200237, Peoples R China

年份：2024

卷号：49

外文期刊名：SURFACES AND INTERFACES

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001243426200001)】；

基金：This work was supported by the National Natural Science Foundation of China (52073091, 52373073, 52303083, 22171086) , Shanghai Pujiang Program (22PJ1402500) and the Key Laboratory of Advanced Polymeric Materials of Shanghai.

语种：英文

外文关键词：A. hybrid; A. Polymer -matrix composites (PMCS); B. Electrical properties; B. High -temperature properties

摘要：Polyetherimide (PEI) has great potential as a dielectric because of its high -temperature resistance, but its low energy storage density limits practical applications. Incorporating hafnium dioxide (HfO2) with a moderate dielectric constant (k) and wide bandgap can simultaneously enhance the polarization intensity of PEI and potential barriers for charge injection. Nevertheless, the poor compatibility between HfO2 and PEI inevitably introduces defects, thereby weakening the inhibitory effect on dielectric loss. To tackle this issue, an organic double interface layer is introduced to enhance dielectric performance, where the polar poly(arylene ether urea) (PEEU) containing hydrogen bonds can ensure the layer's compactness. Notably, its non-bonding urea groups serve as deep traps to capture migrating carriers, and the gradient k values of HfO2, PEEU, and PEI help mitigate electric field distortions at the interface, therefore enhancing the suppression of conduction loss. The polarity of PEEU and the introduction of multiple interfaces significantly contribute to an increased k (maximum 9.7, at 1 kHz). At 300 kV mm -1, 5 vol% PEEU@HfO2/PEI achieves a discharged energy density of 3.3 J cm -3 and a high charge -discharge efficiency of 83 %, surpassing 5 vol% HfO2/PEI by 1.95 and 2.44 times, respectively. The further COMSOL simulation verifies and proves this work as a novel design strategy for nanocomposite dielectrics.