Chemically bonding BaTiO3 nanoparticles in highly filled polymer nanocomposites for greatly enhanced dielectric properties. Issue 26 (8th June 2020)

• Record Type: Journal Article
• Authors: Chen, Rui-Chao; Zhang, Quan-Ping; Ke, Kai; Sun, Nan; Xu, Wei-Di; Liu, Dong-Liang; Yang, Wenbin; Li, Yin-Tao; Zhou, Yuan-Lin; Yang, Ming-Bo; Yuan, Jinkai; Yang, Wei
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 26(2020)
• Page Start: 8786
• Page End: 8795
• Publication Date: 2020-06-08
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0tc01296c
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : BaTiO3 nanoparticles with extremely high loading are chemically bonded with silicone rubber via "thiol–ene click", leading to superior dielectric properties. Abstract : Dielectric nanomaterials offer great promise for diverse technological applications such as capacitors, actuators, and sensors. Unfortunately, the exploitation of desirable dielectric properties in polymer nanocomposites is a great challenge due to lack of efficient routes to achieve uniform dispersion of nanoparticles and good compatibility of interfaces at high nanoparticle loadings. A dilemma between the nanofiller loading and dispersion as well as interfacial compatibility makes it impossible to fully exploit the intrinsic polarization of the nanoparticles. Herein, we solve such a dilemma and fabricate highly filled barium titanate/silicone rubber (BT/SR) nanocomposites through chemically bonding BT nanoparticles with SR by "thiol–ene click" and isostatic pressing techniques. BT loading varies from 88 wt% to 97 wt% without compromising the uniform dispersion quality and good interfacial adhesion with the SR matrix. The 90 wt% BT nanocomposite shows an optimum dielectric constant as high as 55, while its loss tangent can be kept as low as 0.019 at 10 3 Hz. Meanwhile, it displays good stability of dielectric properties from room temperature up to 100 °C. In addition, the breakdown strength just decreases slightly compared to neat SR (97 MV m −1 ) but is still beyond 75 MV m −1 . The present work provides a facile strategy towards superior dielectric polymer nanocomposites.