(Ba0.6Sr0.4)TiO3/PEEK composites modified by polyethersulfone with low dielectric constant and high dielectric tunability under DC bias

材料科学 复合材料 电介质 偷看 陶瓷 高-κ电介质 介电常数 复合数 介电损耗 微观结构 聚合物 光电子学
作者
Shuhang Liu,Yiting Guo,Guoxin Hu,Sichen Wu,Jie Xu,Jianxin Chen,Weronika Bulejak,H.D. Baxter,Bin Yang,Jie Kong,M. Szafran,Feng Gao
出处
期刊:Composites Science and Technology [Elsevier BV]
卷期号:233: 109929-109929 被引量:8
标识
DOI:10.1016/j.compscitech.2023.109929
摘要

Ceramic/polyetheretherketone (PEEK) composites show a wide range of applications and have attracted extensive interest in the scientific community due to their outstanding dielectric and mechanical characteristics. However, the interface connection between the ceramic and PEEK is a vital issue that must be addressed to improve their physical and electrical properties. In this work, the polyethersulfone resin (PES) was selected as interface modifier between barium strontium titanate (Ba0.6Sr0.4TiO3, BST) and PEEK. Cold-pressing sintering was used to create BST/PEEK materials with superior dielectric frequency stability and dielectric tunability. The effects of PES content on the morphology and dielectric characteristics of PES modified BST/PEEK materials were investigated. The results showed PES could improve the dispersion of BST particles in polymer. The dielectric constant, dielectric tunability, and breakdown strength increased first, then reduced as PES content increased. The composite had the most homogeneous microstructure and the best dielectric properties when the PES content was 7.5 vol%. The frequency dispersion factor F(x) was much smaller than that of other ceramic/polymer composites reported. In addition, the dielectric tunability of the composites could reach a relatively high level (34.18%) while the dielectric constant was as low as 14. The dielectric tunable efficiency (TuE) was proposed to evaluate the property of low dielectric constant and high dielectric tunability under DC bias. The TuE of PES modified BST/PEEK composites show the highest value comparing with reported dielectric tunable composites. This research laid the path for the development of a novel ceramic/polymer composite with good interface bonding and high dielectric tunability.
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