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Title: Enhancement in electroactive crystalline phase and dielectric performance of novel PEG-graphene/PVDF composites
Authors: Chen, JJ
Li, Y 
Zheng, XM
He, FA
Lam, KH 
Keywords: PEG-graphene
Polyvinylidene fluoride
Electroactive crystalline
Dielectric performance
Issue Date: 2018
Publisher: North-Holland
Source: Applied surface science, 1 Aug. 2018, v. 448, p. 320-330 How to cite?
Journal: Applied surface science 
Abstract: 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.
ISSN: 0169-4332
EISSN: 1873-5584
DOI: 10.1016/j.apsusc.2018.04.144
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