Green Preparation of Core-shell BT@PANI Particles and Dielectric Properties of Poly(vinylidene fluoride)-based Composites
WANG Haiyan1,†,*, XIAN Longdi1,†, SHANG Tianrong1, YAO Jiaqi1, YAN Xiaobin1, LI Lan2
1 School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China 2 College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou 730050, China
Abstract: Dielectric capacitors composed of polymer-matrix composite films with high dielectric constants have a practical application and prospect in the fields of new energy vehicles, solar and wind power grid-connected power generation and energy storage and so on. Barium titanate/polymer composites, which present low dielectric loss and high breakdown field strength, are the prospective materials used as the core part of the capacitors. Now, it is urgent to solve the problem of the balanced improvement on high polarizability and low loss. In this work, barium titanate@polyaniline (BT@PANI) core-shell particles were prepared by the in-situ polymerization using malic acid as a surface modification agent for BT particles and a doping agent of PANI. Then polyvinylidene fluoride (PVDF)-based composites were prepared. The results show that barium titanate-aniline cationic particles (BT-An+) was obtained by two-step surface modification of malic acid and hydrochloric acid, and so the core-shell structure character of all products prepared under various mass rations of An and BT is clear. When the mass ratio of An to BT is 0.5∶1, the average particle size is 450 nm and the distribution is the narrowest. and its conductivity value is 1.45×10-3 S/cm. The PVDF-based composite with 30wt% BT@PANI loading has high dielectric constants which vary from 31 to 15 in range of 103—106 Hz. Meanwhile, the dielectric loss remained less than 0.3 within the wide frequency range. The BT@PANI/PVDF composite presents not only good frequency stability but also effective suppression of dielectric loss under the condition of obtaining high dielectric constant. In addition, this work greatly reduces the utilization rate of inorganic oxidizing acids and organic agents and so provides an experimental guidance for green preparation of high performance dielectric composites.
通讯作者: *王海燕,兰州理工大学材料科学与工程学院副教授、硕士研究生导师。目前主要从事先进能源复合电介质材料、超级电容器电极材料等领域的研究工作。发表学术论文40余篇,包括Composites Science and Technology、Journal of Materials Science: Materials in Electronics、Journal of Applied Polymer Science、《高电压技术》等。主持和参与国家自然科学基金项目3项。wanghy03@163.com
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2024, Vol. 38 
