化工进展 ›› 2020, Vol. 39 ›› Issue (5): 1851-1856.doi: 10.16085/j.issn.1000-6613.2019-1442

• 材料科学与技术 • 上一篇    下一篇

GO@TA-Fe/PVDF纳米复合材料制备与介电性能

张帆1(), 周文英1(), 张财华1, 李旭1, 汪广恒1, 闫智伟2   

  1. 1.西安科技大学化学与化工学院,先进电工材料研究中心,陕西 西安 710054
    2.咸阳天华电子科技有限公司,陕西 咸阳 712000
  • 发布日期:2020-05-25
  • 通讯作者: 周文英 E-mail:513812850@qq.com;wyzhou2004@163.com
  • 作者简介:张帆(1993—),男,硕士研究生,研究方向为聚合物介电储能材料。E-mail:513812850@qq.com
  • 基金资助:
    国家自然科学基金(51577154)

Preparation and dielectric properties of GO@TA-Fe/PVDF nanocomposites

Fan ZHANG1(), Wenying ZHOU1(), Caihua ZHANG1, Xu LI1, Guangheng WANG1, Zhiwei YAN2   

  1. 1.Advanced Electrical Materials Research Center, College of Chemistry and Chemical Engineering, Xi?an University of Science & Technology, Xi?an 710054, Shaanxi, China
    2.Xianyang Tianhua Electronics Technology Co. , Ltd. , Xianyang 712000, Shaanxi, China
  • Published:2020-05-25
  • Contact: Wenying ZHOU E-mail:513812850@qq.com;wyzhou2004@163.com

摘要:

为降低氧化石墨烯(GO)/聚偏氟乙烯(PVDF)体系的介电损耗,本文采用单宁酸-铁配合物(TA-Fe)修饰GO表面,将改性GO和PVDF复合后制得了GO@TA-Fe/PVDF纳米复合电介质材料,研究了GO@TA-Fe对PVDF复合材料的微观形貌及介电性能影响。研究结果表明,TA-Fe包覆层强化了GO与PVDF基体间界面相容性及界面作用力,促进了GO在基体中均匀分散;TA-Fe界面层的存在显著降低了GO/PVDF漏导电流及损耗,归因于绝缘界面层有效阻止了GO之间直接接触,抑制漏导电流;TA-Fe用量对体系介电性能有明显影响,随TA-Fe用量增大,体系的介电损耗和电导率显著降低。与GO/PVDF相比,质量分数2%的GO@TA-Fe/PVDF在100Hz下介电常数为1000,而介电损耗由19.8降低为0.08。本研究制备的高介电常数及低损耗的柔性GO@TA-Fe/PVDF纳米电介质材料在电子器件及电力设备领域具有潜在应用。

关键词: 单宁酸-铁涂层, 氧化石墨烯, 聚合物, 界面, 介电性能

Abstract:

To reduce the dielectric loss of graphene oxide (GO)/PVDF(polyvinylidene fluoride) nanocomposites, the tannic acid-iron complexes(TA-Fe) was used to modify the surface of pristine GO, and the modified GO was employed as filler to reinforce PVDF. The effects of GO@TA-Fe on the microstructures and dielectric properties of the PVDF nanocomposites were studied. The results showed that the introduction of the TA-Fe interface layer improved the interfacial compatibility and interactions between the GO and PVDF matrix, promoting the GO homogeneous dispersion in the matrix. The use of TA-Fe interface layer rapidly decreased the dielectric loss and leakage current of the composites because the TA-Fe interface layer effectively prevented direct contact between the GO nanosheets, thus suppressing the leakage current. Further, the TA-Fe dosage had significant effect on the dielectric properties of nanocomposites. The dielectric loss and conductivity decreased remarkably with an increase in TA-Fe loading. The 2% GO@TA-Fe/PVDF exhibited a high permittivity of 1000 at 100Hz and a very low loss of 0.08 compare with 19.8 for the mass fraction 2% GO/PVDF. The prepared flexible GO@TA-Fe/PVDF nanocomposites with high dielectric constant and low loss had potential applications in the field of electronic devices and power equipment.

Key words: tannic acid-iron coating, graphene oxide, polymers, interface, dielectric properties

中图分类号: 

  • TQ31