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Methoxypolyethylene glycol functionalized carbon nanotube composites with high permittivity and low dielectric loss
Affiliation:1. Department of Orthopaedics, Chinese Air Force General Hospital, No. 30 Fucheng Road, Beijing 100142, China;2. Department of Neurosurgery, Chinese Air Force General Hospital, No. 30 Fucheng Road, Beijing 100142, China;3. School of Pharmacy, Fudan University, No. 826 Zhangheng Road, Shanghai 201203, China;1. School of Pharmaceutical and Chemical Engineering, Taizhou University, Taizhou 318001, China;2. Department of Materials, College of Engineering, Zhejiang A & F University, Hangzhou 311300, China;3. Zhejiang Baina Rubber Equipment Co. Ltd., Taizhou 317300, China;1. School of Chemical Engineering, Sungkyunkwan University, Suwon, Korea;2. Department of Electronic Engineering, Kwangwoon University, Seoul, Korea;1. State Key Laboratory of Silicate Materials for Architectures, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China;2. Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA, 16802, USA;1. School of Physics and Electronic Engineering, Guangzhou University, Guangzhou 510006, China;2. School of Materials Science & Engineering, Tongji University, 4800 Caoan Road, Shanghai 201804, China;3. School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China;1. Department of Materials Chemistry, School of Science, Xi’an Jiaotong University, Xi''an, Shaanxi 710049, China;2. Xi’an Key Laboratory of Sustainable Energy Materials Chemistry, Xi’an Jiaotong University, Xi''an, Shaanxi 710049, China
Abstract:High relative permittivity and low dielectric loss were simultaneously achieved in the percolative nanocomposites with methoxypolyethylene glycol (mPEG) modified multi-walled carbon nanotubes (MWCNTs). The dense mPEG layer with a thickness of approximately 1.7 nm was continuously coated on the surface of MWCNTs. MWCNTs exhibited excellent dispersibility after being functionalized by mPEG (mPEG@MWCNTs), the mPEG@MWCNTs/ethanol suspension was still turbid even when the suspension was deposited for two months. A high permittivity of 69.7 and a low dielectric loss of 0.042 were simultaneously achieved in the poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) nanocomposite with 4.02 vol% mPEG@MWCNTs at 1 kHz. The improved dielectric properties in the nanocomposite is mainly ascribed to the following reasons: (i) the increased microcapacitors formed by MWCNTs and insulated dielectric composite; (ii) the enhanced interfacial polarization due to the homogeneous dispersion of mPEG@MWCNTs in the nanocomposites and tight adhesion between mPEG@MWCNTs and P(VDF-HFP) matrix.
Keywords:MWCNTs  Percolative composites  Permittivity  P(VDF-HFP)
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