Interface Enhancement-Induced Improvement of Dielectric Traits in Poly(Ether Sulfone)/Ti 3 C 2 MXene/KH550 Nanocomposite
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https://doi.org/10.1007/s11664-020-08467-2 2020 The Minerals, Metals & Materials Society
Interface Enhancement-Induced Improvement of Dielectric Traits in Poly(Ether Sulfone)/Ti3C2 MXene/KH550 Nanocomposites QIHUANG DENG,1,4 FURONG ZHOU,2 YEFENG FENG ZHICHAO XU,3 and CHENG PENG1
,1,5
1.—Key Laboratory of Extraordinary Bond Engineering and Advance Materials Technology (EBEAM) of Chongqing, School of Materials Science and Engineering, Yangtze Normal University, Chongqing 408100, People’s Republic of China. 2.—Department of Fashion Communication and Media, Jiangxi Institute of Fashion Technology, Nanchang 330201, People’s Republic of China. 3.—Ministry of Education’s Key Laboratory of Poyang Lake Wetland and Watershed Research, Jiangxi Normal University, Nanchang 330022, People’s Republic of China. 4.—e-mail: [email protected]. 5.—e-mail: [email protected]
Two-dimensional conductive MXenes are employed as fillers for fabricating polymer-based high-permittivity composite dielectrics. However, high dielectric loss from high interfacial leakage conduction is a shortcoming. To obtain low interfacial leakage conduction, in this work we selected high-modulus poly(ether sulfone) (PES) as matrix and (3-aminopropyl)triethoxysilane (KH550) as interface compatibilizer. Ternary PES/Ti3C2 MXene/KH550 nanocomposites were fabricated by solution casting. Compared with PES/ MXene composites, the ternary counterparts have improved permittivity and reduced dielectric loss and conductivity. The increased permittivity is ascribed to enhanced interfacial polarization. The reduction in dielectric loss and conductivity stems from lower interfacial leakage conduction as a result of improved interface compatibility. The ternary composite with 4 wt.% MXene exhibited high permittivity of 81, low dielectric loss of 0.12 and low conductivity of 6.3 9 107 S m1 at 100 Hz. This work may enable the large-scale fabrication of promising composite dielectrics.
(Received July 13, 2020; accepted September 2, 2020)
Deng, Zhou, Feng, Xu, and Peng
Graphic Abstract
Key words: Dielectric, composite, interface, MXene, KH550
INTRODUCTION Renewable energy devices such as dielectric capacitors for electrostatic energy storage are attracting much attention in the field of materials science due to the exhaustion of non-renewable fossil energy sources.1 Compared with batteries, dielectric capacitors exhibit the unique advantage of high power density. However, their low energy density has been found to be a major disadvantage. The energy density of a dielectric is determined by both its permittivity and electrical breakdown strength.2 Improving either the permittivity or the breakdown strength may be helpful in increasing the energy density. Dielectric materials with high flexibility are required in modern film-shaped capacitors with a high level of integration and small volume.3 Highly flexible polymers have attracted wide research interest. However, the large-scale production of polymer dielectrics is limited by their rather low permittivity.4 To
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