BaTiO₃–polyethersulfone nanocomposites with high dielectric constant and excellent thermal stability

• Published in: Composites. Part B, Engineering Vol. 42; no. 1; pp. 87 - 91
• Main Authors: Wang, F.J, Li, W, Xue, M.S, Yao, J.P, Lu, J.S
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 2011; Elsevier
• Subjects: ambient temperature; Applied sciences; Composites; Dielectric constant; dielectric properties; Dispersions; Exact sciences and technology; Forms of application and semi-finished materials; glass transition temperature; Meters; Nanocomposites; Polymer industry, paints, wood; Tangents; Technology of polymers; Thermal properties; Thermal stability; Ultrasonic testing; Weight loss; B. Electrical properties; Dielectric loss; Electrical properties; Dielectric properties; Ethersulfone polymer; Barium titanates; Processability; Experimental study; Oxide ceramics; Composite material; Thermal stability; Thermal properties; A. Polymer-matrix composites (PMCs); Hot pressing; Concentration effect; Nanocomposite; Technological properties; Permittivity
• ISSN: 1359-8368; 1879-1069
• DOI: 10.1016/j.compositesb.2010.08.006

BaTiO₃–polyethersulfone (PES) nanocomposites were prepared using the simple ultrasonic dispersion and hot-pressing method. The dielectric properties and thermal properties of the obtained composites were investigated using a LCR digital meter, a thermal gravimetric analyzer (TGA), and a differential scanning calorimeter (DSC). The results indicated that the BaTiO₃–PES composites possessed desirable properties, such as high dielectric constant, low loss tangent, high thermal stability, as well as good processability. Furthermore, the dielectric constants of the composites were weak frequency dependent from 10kHz to 100kHz and weak temperature dependent from 20°C to 150°C. In addition, most loss tangents of the composites were less than 0.05. Furthermore, the composites exhibited high glass transition temperature (>225°C) and high 5.0% weight loss temperature (>500°C). The present work indicated that the BaTiO₃–PES composites could be a candidate for embedded capacitors under the high temperature environment.