Improving dielectric properties of poly(vinylidene fluoride) composites: effects of surface functionalization of exfoliated graphene
Improving dielectric properties of poly(vinylidene fluoride) composites: effects of surface functionalization of exfoliated graphene
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DOI：
10.1080/01694243.2014.1003497
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发表时间：
2015-01
影响因子：
2.3
通讯作者：
Shuai Wang;Liangsen Liu;Yan Zeng;Baoming Zhou;Kunyue Teng;Meijun Ma;Lei Chen;Zhiwei Xu
中科院分区：
文献类型：
--
作者：
Shuai Wang;Liangsen Liu;Yan Zeng;Baoming Zhou;Kunyue Teng;Meijun Ma;Lei Chen;Zhiwei Xu
为了研究剥离型石墨烯（EG）表面功能化对聚偏氟乙烯（PVDF）β晶型和介电性能的影响，制备了不同功能化EG增强PVDF基复合材料。X射线光电子能谱（XPS）结果表明，改性后的EG表面引入了C-OH、C-O-C、C=O、COOH和C-F等多种化学官能团。红外光谱和X射线衍射分析结果表明，功能化EG的加入可以使复合材料中形成β相PVDF。在102 ~ 107 Hz的频率范围内，PVDF复合材料的介电常数随羰基（C=O）含量的变化而明显增大。在所有的复合材料中，EG接枝聚甲基丙烯酸甲酯/PVDF复合材料具有最高的介电常数和介电损耗。
To investigate the effects of surface functionalization of exfoliated graphene (EG) on the crystalline form of β-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 β-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.