Improving dielectric properties of poly(vinylidene fluoride) composites: effects of surface functionalization of exfoliated graphene
作者：Wang, Shuaijie Liu, Liangsen Zeng, Yan Zhou, Baoming Teng, Kunyue Ma, Meijun Chen, Lei Xu, Zhiwei
關鍵字：PVDF composites
論文來源：期刊
具體來源：Journal of Adhesion Science and Technology, 29 (2015), 678-90
發(fā)表時間：2015年
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To investigate the effects of surface functionalization of exfoliated graphene (EG) on the crystalline form of ?-phase and dielectric properties of poly(vinylidene fluoride) (PVDF), we prepared PVDF-based composites reinforced by different functionalized EG. The X-ray photoelectron spectroscopy results indicated that a wide variety of chemical functional groups such as C?OH, C?O?C, C=O, COOH and C?F could be introduced on the surface of modified EG. As confirmed by results of Fourier transform infrared spectrum and X-ray diffraction, the ?-phase PVDF can be produced in the composites with the incorporation of functionalized EG. In the frequency ranging from 102 to 107 Hz, the dielectric permittivity of PVDF composites shows an obvious increase owing to a variation of the carbonyl group (C=O) content. Among all the composites, the EG grafted with polymethyl methacrylate/PVDF composite has the highest dielectric permittivity and dielectric loss.