文献类型：期刊文献

英文题名：Enhancing Dielectric and High-Temperature Energy Storage Capability for Benzoxazole Polymer Films Featuring Naphthalene Ring Blocks

作者：Wang, Xinhua[1];Ni, Xinyao[1];Yuan, You[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 Specially Funct Polymer Mat & Related Tec, Minist Educ, Shanghai 200237, Peoples R China

年份：2023

卷号：5

期号：10

起止页码：8143

外文期刊名：ACS APPLIED POLYMER MATERIALS

收录：;EI(收录号：20234114847227);WOS:【SCI-EXPANDED(收录号:WOS:001066132600001)】；

基金：All authors are grateful for financial support from the National Natural Science Foundation of China (nos. 52073091 and 2171086), Shanghai Pujiang Program (no. 22PJ1402500), Natural Science Foundation of Shanghai (no. 20ZR1414600), and the Fundamental Research Funds for the Central Universities (no. JKD01231701).

语种：英文

外文关键词：polymer dielectric films; energy storage; naphthalene; PBO; structural modifications

摘要：All-organic polymer dielectrics used in electrical and electronic systems have been proven to be an efficient option for large-scale industrial production. Modifying the side chain of polymers can improve the energy storage performance of polymers, but it can hardly solve the problem of failure under high-temperature application. Herein, an innovative approach is proposed to introduce a group with high temperature resistance into the main chain to reconstruct the chain structure to solve the abovementioned problem. Concretely, a naphthalene ring was introduced to the chain of polyphenylene benzodioxazole (PBO) that is the most promising polymer applied in a high-temperature environment. The naphthalene ring endows the molecular structure with both enhanced permittivity and breakdown strength by decoupling the conjugation of the main chain, increasing the dielectric constant. Meanwhile, an appropriate ratio of benzene-naphthalene as deep traps enables reduced carriers' mobility and an increased band gap, thereby enhancing the breakdown strength. The discharged energy density of the copolymer reached 5.26 J/cm3 with a charge-discharge efficiency of 91.8% under 450 MV/m at room temperature. Simultaneously, a discharged energy density of 3.1 J/ cm3 was also obtained at 150 degrees C. This work provides a scalable approach to explore polymer dielectrics by freely introducing a small amount of local structural modifications.