Greatly enhanced dielectric permittivity in poly(vinylidene fluoride)-based polymeric composites induced by Na1/3Ca1/3Bi1/3Cu3Ti4O12 nanoparticles
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Greatly enhanced dielectric permittivity (ε′) in poly(vinylidene fluoride) (PVDF) polymeric composites was induced by incorporating Na1/3Ca1/3Bi1/3Cu3Ti4O12 (NCB) nanoparticles. The NCB/PVDF composites were fabricated by conventional mixed powders and hot pressing. Nanosized (NCB-NPs) and microsized-powders (NCB-MPs) prepared, respectively, by chemical combustion and solid state reaction methods were used as fillers. The dispersion of NCB-NPs was quite good in the PVDF matric. A greatly improved ε′ of PVDF-based polymeric composites can be induced by filling with NCB-NPs compared to that of the NCB-MPs/PVDF composite. Interestingly, at 103 Hz, the nanocomposite with 50 vol% of NCB-NPs can exhibit good dielectric properties with high ε′ of about 210.8 and low loss tangent (tanδ ≈ 0.83). This enhanced ε′ value is much larger than that of PVDF polymer by a factor of ≈20. The increase in ε′ in the nanocomposites is attributed to large interfacial areas and very short interparticle distance. These can cause a great increase in the interfacial polarization intensity.
KeywordsVinylidene Fluoride Ceramic Filler Polarization Intensity Good Dielectric Property PVDF Matrix
This work was financially supported by the Thailand Research Fund (TRF) and Khon Kaen University under the TRF Senior Research Scholar Contract No. RTA5780004. P. Kum-onsa would like to thank the Science Achievement Scholarship of Thailand (SAST) for her Master of Science Degree scholarship.
- 12.J. Bi, Y. Gu, Z. Zhang, S. Wang, M. Li, Z. Zhang, Mater. Des. 89, 933 (2016)Google Scholar