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    刘强, 钱军, 程志鹏, 寇文娟, 庄启昕. 核壳结构Fe3O4@C改性PVDF柔性薄膜的介电性能研究[J]. 华东理工大学学报(自然科学版), 2020, 46(2): 179-188. DOI: 10.14135/j.cnki.1006-3080.20190218002
    引用本文: 刘强, 钱军, 程志鹏, 寇文娟, 庄启昕. 核壳结构Fe3O4@C改性PVDF柔性薄膜的介电性能研究[J]. 华东理工大学学报(自然科学版), 2020, 46(2): 179-188. DOI: 10.14135/j.cnki.1006-3080.20190218002
    LIU Qiang, QIAN Jun, CHENG Zhipeng, KOU Wenjuan, ZHUANG Qixin. Core/Shell-Structured Fe3O4@C/PVDF Flexible Films with Improved Dielectric Properties[J]. Journal of East China University of Science and Technology, 2020, 46(2): 179-188. DOI: 10.14135/j.cnki.1006-3080.20190218002
    Citation: LIU Qiang, QIAN Jun, CHENG Zhipeng, KOU Wenjuan, ZHUANG Qixin. Core/Shell-Structured Fe3O4@C/PVDF Flexible Films with Improved Dielectric Properties[J]. Journal of East China University of Science and Technology, 2020, 46(2): 179-188. DOI: 10.14135/j.cnki.1006-3080.20190218002

    核壳结构Fe3O4@C改性PVDF柔性薄膜的介电性能研究

    Core/Shell-Structured Fe3O4@C/PVDF Flexible Films with Improved Dielectric Properties

    • 摘要: 通过高温碳化将碳壳包覆在纳米四氧化三铁表面,形成Fe3O4@C的核壳结构。与单一结构填料粒子相比,核壳结构的Fe3O4@C在有机基体中的分散更均匀,相容性更高;以此制得具有高介电常数、低介电损耗的Fe3O4@C/聚偏氟乙烯(PVDF)柔性薄膜。与Fe3O4/PVDF、碳纤维/PVDF和石墨(GO)/PVDF等材料相比,Fe3O4@C/PVDF柔性薄膜的介电常数高达115(常温,1 kHz),但介电损耗维持在0.063的较低水平;同时,其拉伸强度由纯PVDF的42.3 MPa增加到76.6 MPa,弹性模量由1.3 GPa增加到2.0 GPa,可作为一种柔性高介电薄膜应用于微型电容等电子元器件领域。

       

      Abstract: The carbon shell was coated on the surface of ferroferric oxide via high temperature carbonization to form the core-shell structure of Fe3O4@C. Compared with the single structured filler particles, the core-shell structure of Fe3O4@C was more uniform and more compatible with the organic matrix. Thus, the Fe3O4@C/PVDF (Polyvinylidene fluoride)flexible film with high dielectric constant and low dielectric loss was obtained. Carbon shell plays a key role in improving the dielectric properties of materials. The carbon shell can not only be used as a transition layer between the Fe3O4 core and the PVDF matrix, but also strengthen the interfacial polarization of the material. The improvement of the dielectric properties of the materials is mainly based on percolation theory and interfacial polarization theory. According to the experiment, the percolation threshold of Fe3O4@C was 12%. During the experiment, it is necessary to accurately control the amount of added filler. At this packing ratio, the film was filled with countless microcapacitors and the dielectric constant of the material was increased rapidly. At the same time, the interfacial polarization of the electric dipole between different interfaces further enhanced the dielectric properties of the material. Compared with pure PVDF, carbon fiber/PVDF and graphene oxide (GO)/PVDF, the Fe3O4@C/PVDF flexible film prepared in this paper has a higher dielectric constant of 115 (normal temperature, 1 kHz) and lower dielectric loss of 0.063. Meanwhile, compared with pure PVDF, its tensile strength was increased from 42.3 MPa to 76.6 MPa, and the elasticity modulus was increased from 1.3 GPa to 2.0 GPa. Thus, the prepared materials can be used as a flexible film with high dielectric in electronic components and other fields.

       

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