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

Chen, J.-J., Li, Y., Zheng, X.-M., He, F.-A. and Lam, K.-H. (2018) Enhancement in electroactive crystalline phase and dielectric performance of novel PEG-graphene/PVDF composites. Applied Surface Science, 448, pp. 320-330. (doi: 10.1016/j.apsusc.2018.04.144)

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 thermogravimetric 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, WAXD, 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.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Lam, Dr Koko
• Authors: Chen, J.-J., Li, Y., Zheng, X.-M., He, F.-A., and Lam, K.-H.
• College/School: College of Science and Engineering > School of Engineering > Systems Power and Energy
• Journal Name: Applied Surface Science
• Publisher: Elsevier
• ISSN: 0169-4332
• ISSN (Online): 1873-5584

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