GO@TA-Fe/PVDF纳米复合材料制备与介电性能  

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

作　　者：张帆 周文英[1] 张财华 李旭 汪广恒[1] 闫智伟 ZHANG Fan;ZHOU Wenying;ZHANG Caihua;LI Xu;WANG Guangheng;YAN Zhiwei(Advanced Electrical Materials Research Center,College of Chemistry and Chemical Engineering,Xi?an University of Science&Technology,Xi?an 710054,Shaanxi,China;Xianyang Tianhua Electronics Technology Co.,Ltd.,Xianyang 712000,Shaanxi,China)

机构地区：[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

出　　处：《化工进展》2020年第5期1851-1856,共6页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(51577154)。

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。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@TAFe/PVDF nanocomposites with high dielectric constant and low loss had potential applications in the field of electronic devices and power equipment.

关 键 词：单宁酸-铁涂层 氧化石墨烯 聚合物 界面 介电性能 

分 类 号：TQ31[化学工程—高聚物工业]