Enhancement in electroactive crystalline phase and dielectric performance of novel PEG-graphene/PVDF composites

被引:50
作者
Chen, Jun-Jun [1 ]
Li, Ying [2 ]
Zheng, Xu-Min [1 ]
He, Fu-An [1 ]
Lam, Kwok-Ho [2 ]
机构
[1] Guangdong Univ Petrochem Technol, Coll Chem Engn, Maoming, Guangdong, Peoples R China
[2] Hong Kong Polytech Univ, Dept Elect Engn, Kowloon, Hong Kong, Peoples R China
关键词
PEG-graphene; Polyvinylidene fluoride; Composites; Electroactive crystalline; Dielectric performance; POLY(VINYLIDENE FLUORIDE); PYROELECTRIC PROPERTIES; POLYSTYRENE COMPOSITES; NANOCOMPOSITES; PERMITTIVITY; GRAPHITE; STORAGE; OXIDE; NANOGENERATOR; NANOPARTICLES;
D O I
10.1016/j.apsusc.2018.04.144
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In this work, polyethylene glycol grafted graphene (PEG-graphene) was obtained from the amidation reaction between graphene oxide and methoxypolyethylene glycol amine followed by the NaHB4 reduction and characterized by transmission electron microscope, Fourier transform infrared spectroscope, wide-angle X-ray diffraction, Raman spectroscope, X-ray photoelectron spectroscope, and thermogravi-metric analysis. The PEG-graphene was incorporated into polyvinylidene fluoride (PVDF) to form novel PEG-graphene/PVDF composites by the solution blending method. The well dispersion of PEG-graphene in the PEG-graphene/PVDF composite was confirmed by scanning electron microscopy. Based on the results of FTIR, WARD, differential scanning calorimetry, and XPS, it was found that the presence of PEG-graphene effectively enhanced the electroactive crystalline content of PVDF from 24.6% for the pure PVDF to 90.5% for the PEG-graphene (15 wt.%)/PVDF composite by the interfacial interaction. Moreover, the PEG-graphene (10 wt.%)/PVDF composite near the percolation threshold possessed a much higher dielectric constant of 53.3 compared to the pure PVDF (8.2), and a relatively low dielectric loss of 0.265 at 1000 Hz. (C) 2018 Elsevier B.V. All rights reserved.
引用
收藏
页码:320 / 330
页数:11
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