文献类型：期刊文献

英文题名：Benzoxazole-polymer@CCTO hybrid nanoparticles prepared via RAFT polymerization: toward poly(p-phenylene benzobisoxazole) nanocomposites with enhanced high-temperature dielectric properties

作者：Jiang, Junhao[1];Li, Jinpeng[1];Qian, Jun[1];Liu, Xiaoyun[1];Zuo, Peiyuan[1];Yuan, You[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：2021

卷号：9

期号：46

起止页码：26010

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY A

收录：;EI(收录号：20215011308889);WOS:【SCI-EXPANDED(收录号:WOS:000719503400001)】；

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：Permittivity - Dielectric materials - Titanium compounds - Copper compounds - Aromatic compounds - Calcium compounds - Nanoparticles - High temperature applications

摘要：Polymer nanocomposites with high energy density have become a research hotspot in the field of dielectric materials. However, the huge compatibility contrast between nanofillers and polymers always hinders the further improvement of dielectric properties. Meanwhile, next-generation dielectrics should possess excellent thermal stability to cope with the development of high-temperature applications. Herein, a novel polymer nanocomposite based on heat-resistant poly(p-phenylene benzobisoxazole) (PBO) and high-permittivity CaCu3Ti4O12 (CCTO) nanoparticles was prepared by the solution method. In this process, electroactive polymer poly(2-isopropenylbenzoxazole) (P(2-IBO)), which has a chemical structure similar to PBO and contains numerous permanent dipoles, is selected as the modifier to optimize the electric field behavior at the interface, and it is coated on the surface of CCTO nanoparticles via surface-initiated reversible addition-fragmentation chain transfer (RAFT) polymerization for achieving controllable dielectric properties. The results demonstrate that the dielectric properties can be adjusted by changing the thickness of the P(2-IBO) shell. The breakdown strength and energy density of the modified CCTO/PBO nanocomposites are much higher than those of the unmodified CCTO/PBO nanocomposites. Under an electric field of 200 kV mm(-1), the maximum discharge energy density reaches 3 J cm(-3), which is about 500% that of pure PBO (0.6 J cm(-3)). Moreover, the dielectric properties are nearly independent of the testing temperature (25 to 200 degrees C), indicating that this nanocomposite is an ideal candidate for high-temperature dielectric materials.