文献类型：期刊文献

中文题名：钛酸钡/苯并噁唑树脂耐高温纳米复合材料的制备和介电性能

英文题名：Preparation and Dielectric Properties of High Temperature Resistant Barium Titanate/Benzoxazole Nano-Composites

作者：姜正涛[1];刘小云[1];汪文涛[1];庄启昕[1]

机构：[1]华东理工大学材料科学与工程学院,上海市先进聚合物材料重点实验室,上海200237

年份：2023

卷号：49

期号：1

起止页码：55

中文期刊名：华东理工大学学报（自然科学版）

外文期刊名：Journal of East China University of Science and Technology

收录：Scopus;北大核心:【北大核心2020】；CSCD:【CSCD_E2023_2024】；

基金：国家自然科学基金(52073091,51773060,22171086);上海市自然科学基金(20ZR1414600);上海市先进聚合物材料实验室开放基金。

语种：中文

中文关键词：苯并噁唑;钛酸钡;介电性能;介电常数;复合材料

外文关键词：benzoxazole;barium titanate;dielectric properties;dielectric constant;composite

摘要：合成了一种新型的热固性苯并噁唑树脂-NPBO,并采用化学接枝的方法制备了聚氨酯包覆钛酸钡核壳结构纳米粒子(PU@BT),将PU@BT与NPBO树脂复合,制备了PU@BT/NPBO纳米复合材料。对NPBO的化学结构和热固化行为进行研究,采用扫描电子显微镜(SEM)和透射电子显微镜(TEM)观察了PU@BT的微观形貌,采用宽频介电谱仪测试了PU@BT/NPBO复合材料的介电性能。研究结果表明:随着PU@BT的体积分数由0提高到10%,复合材料的介电常数大幅提高。当频率为1 kHz时,纯NPBO的介电常数为3.3,而加入体积分数10%的PU@BT后,复合材料介电常数为7.3,相比于纯NPBO,复合材料的介电常数提高了1.21倍。
High temperature and dielectric constant polymer nanocomposites have attracted widespread attention in pulse power system such as mobile electronics, electric vehicles and electronic equipment due to their processing flexibility, light weight, and low cost. Herein, a new type of thermosetting benzoxazole high-temperature resistant resin,NPBO, was synthesized. The chemical structure and thermal curing behavior of NPBO were studied by H-NMR, EIMS spectra and DSC. The resin exhibited excellent thermal properties. Meanwhile, a stepwise chemical grafting was performed to prepare polyurethane-coated barium titanate core-shell hybrid nanoparticles(PU@BT). Then, PU@BT and NPBO resins were hybridized at different ratios to produce PU@BT/NPBO nanocomposites. Using scanning electron microscope(SEM) and transmission electron microscope(TEM), the morphology of PU@BT was first characterized. The particles of PU@BT were found to be well dispersed. Finally, the dielectric properties of the composite were measured by a broadband dielectric spectrometer. As the volume fraction of PU@BT increased from 0to 10%, the dielectric constant of the composite material increased significantly. At 1 kHz, the dielectric constant of NPBO was 3.3. When 10% PU@BT was added, the dielectric constant of the composite increased to 7.3.