文献类型：期刊文献

英文题名：Enhanced dielectric performance with high-temperature stability by interface-modulation of the core-shell structured imide-polymer@BT nanohybrids in PEI-based nanocomposites

作者：Li, Jinpeng[1];Jiang, Junhao[1];Chen, Yi[2];Liu, Xiaoyun[1];Zuo, Peiyuan[1];Cheng, Qilin[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;[2]Shanghai Spaceflight Precis Machinery Inst, Shanghai 201108, Peoples R China

年份：2023

卷号：11

期号：22

起止页码：7289

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY C

收录：;EI(收录号：20232214173200);WOS:【SCI-EXPANDED(收录号:WOS:000987593200001)】；

基金：This work was supported by the National Natural Science Foundation of China (52073091, 51773060, and 22171086), the Natural Science Foundation of Shanghai (20ZR1414600), and the Fundamental Research Funds for the Central Universities (JKD01221632). This work is also sponsored by Shanghai Pujiang Program (22PJ1402500).

语种：英文

外文关键词：Dielectric materials - Dielectric properties of solids - Electric breakdown - High temperature applications - Nanocomposite films - Nanocomposites - Shells (structures) - Thermodynamic stability

摘要：Ceramic-polymer nanocomposites with increased dielectric constant are desired to fabricate advanced film capacitors. However, the introduced ceramics usually lead to a decreased breakdown strength due to their extremely different properties from polymers, thus restricting the substantial improvement of energy density. Herein, a core-shell structured imide-polymer@barium titanate (BT) is designed, and a modulation strategy optimizing the dielectric behavior at the interface of BT-polyetherimide (PEI) by introducing phthalocyanine and -CF3 groups to enhance the dielectric response and construct energy traps is proposed to manufacture a high-performance polymeric dielectric. The interface between BT and PEI is reinforced owing to the electrostatic interaction between the polymer chains of the PEI matrix and the imide-polymer shell. Compared with BT-PEI, the modified BT-PEI nanocomposites exhibit improved comprehensive dielectric properties and breakdown strength. The prepared composite possesses the highest discharge energy density of 3.04 J cm(-3) with a charge-discharge efficiency of 89.25%. Moreover, the dielectric properties of the prepared composites possess excellent thermal stability from 20 degrees C to 150 degrees C. This work provides a promising strategy to develop polymeric dielectrics for high-temperature applications.