Preparation of a novel cross-linked polyetherimide with enhanced breakdown strength and high-temperature energy storage performance  

作　　者：Guangyu Duan Fengying Hu Ruina Zhang Zuming Hu 

机构地区：[1]College of Materials Engineering,Henan University of Engineering,Zhengzhou,China [2]Henan Engineering Technology Research Center for Fiber Preparation and Modification,Henan University of Engineering,Zhengzhou,China [3]State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,Donghua University,Shanghai,China

出　　处：《High Voltage》2023年第3期630-639,共10页高电压（英文）

基　　金：National Key R&D Program of China,Grant/Award Number:2021YFB3700101;Science and Technology Project of Henan Province,Grant/Award Number:222102240033;Foundation for Doctorate Research of Henan University of Engineering,Grant/Award Number:D2021009。

摘　　要：Polymer dielectrics with excellent energy storage performance at high temperature are urgently needed in advanced applications,such as hybrid electric vehicles,smart grid and pulsed power sources.Polyetherimide(PEI),which is supposed to be the most promising candidate among polymer dielectric materials,displays a limitation for high-temperature polymer dielectrics owing to the rapidly decreasing discharged energy density(U_(d))and charge-discharge efficiency(η).Herein,a novel PEI with cross-linked networks was firstly prepared by utilising 2,4,6-Triaminopyrimidine(TAP)as a cross-linker.The results showed that the breakdown strength of the cross-linked PEI(c-PEI)with 2 wt%TAP increased to 399.4 MV/m,showing an increment of 23.3%in comparison with noncross-linked PEI.Additionally,owing to the restrained polarisation loss and relaxation loss by cross-linked networks,the dielectric loss of c-PEI dielectric gradually decreased with the increasing content of TAP.Of particular significance was the c-PEI dielectrics exhibiting improved U_(d)andηat high temperature.The maximum U_(d)of c-PEI with 2 wt%TAP was 2.53 J/cm3 at 150℃,which was 24.8%higher than non-cross-linked PEI(2.11 J/cm^(3)at 150℃).This research provides an innovative strategy to achieve novel PEI dielectrics with improved U_(d)andηat high temperature.

关 键 词：BREAKDOWN DIELECTRIC STRENGTH 

分 类 号：TQ323.7[化学工程—合成树脂塑料工业]