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为了提高BaTiO3/PVDF复合材料的击穿场强。首先,利用多巴胺对BaTiO3进行表面功能化处理,得到多巴胺改性的BaTiO3(Dopa@BaTiO3);然后,将其与聚偏氟乙烯(PVDF)混合,采用液相浇铸法制得Dopa@BaTiO3/PVDF复合材料;最后,测量了不同Dopa@BaTiO3添加量的Dopa@BaTiO3/PVDF复合材料的击穿场强和介电性能。结果表明:与改性前的BaTiO3/PVDF复合材料相比,Dopa@BaTiO3/PVDF复合材料在击穿场强显著提高的同时,介电常数基本保持不变;当Dopa@BaTiO3添加量为3vol%时,击穿场强为210kV/mm,比改性前的复合材料的提高了78%;当Dopa@BaTiO3添加量为10vol%时,击穿场强为180kV/mm,比改性前的合材料的提高了88%。研究解决了BaTiO3/PVDF复合材料击穿场强较低的问题,可为同时提高复合材料的介电常数和击穿场强提供参考。
In order to improve the BaTiO3 / PVDF composite breakdown strength. First, BaTiO3 was surface-functionalized with dopamine to obtain dopamine-modified BaTiO3 (Dopa @ BaTiO3); then, it was mixed with polyvinylidene fluoride (PVDF) and Dopa @ BaTiO3 / PVDF composite Finally, the breakdown field strength and dielectric properties of Dopa @ BaTiO3 / PVDF composites with different Dopa @ BaTiO3 loadings were measured. The results show that the dielectric constant of Dopa @ BaTiO3 / PVDF composites is almost unchanged compared with the pre-modified BaTiO3 / PVDF composites. When the Dopa @ BaTiO3 content is 3vol% , The breakdown field strength is 210kV / mm, which is 78% higher than that of the pre-modified composite. When Dopa @ BaTiO3 is added as 10vol%, the breakdown field strength is 180kV / mm, Material increased by 88%. The research solves the problem of lower breakdown field strength of BaTiO3 / PVDF composites and provides a reference for improving the dielectric constant and breakdown strength of the composites simultaneously.