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https://physrep.ff.bg.ac.rs/handle/123456789/714
Title: | Structural and electrical properties of ferroelectric poly(vinylidene fluoride) and mechanically activated ZnO nanoparticle composite films | Authors: | Peleš, A. Aleksić, O. Pavlović, V. P. Djoković, V. Dojčilović, R. Nikolić, Zoran Marinković, F. Mitrić, M. Blagojević, V. Vlahović, B. Pavlović, V. B. |
Keywords: | crystallization;dielectric properties;mechanical activation;polymer composites;PVDF;ZnO | Issue Date: | 24-Aug-2018 | Journal: | Physica Scripta | Abstract: | The influence of the mechanical activation of ZnO nanoparticle fillers on the structural and electrical properties of the matrix of poly(vinylidenefluoride)-ZnO (PVDF-ZnO) films was investigated. Transmission electron microscopy and scanning electron microscopy analyses showed that mechanical activation in a high energy planetary ball mill reduces the size of ZnO particles. X-ray diffraction and Raman spectroscopy revealed that PVDF crystallized predominantly as the γ-phase. Non-activated ZnO filler reduces the degree of the crystallinity of the matrix and promotes crystallization of α-phase of PVDF in the film, while the fillers activated for 5 and 10 min induce crystallization of β-phase, indicating that mechanical activation of the filler can be used as a general method for fabrication of PVDF composites with increased content of piezoelectric β-phase crystals. Dielectric spectroscopy measurements show that polymer composite with the high content of β-phase (with ZnO filler activated for 5 min) exhibits the highest value of dielectric permittivity in 150-400 K range of temperatures. Kinetic analysis shows combined effects of increased surface area and increased concentration of surface defects on the interactions between polymer chains and activated nanoparticles. |
URI: | https://physrep.ff.bg.ac.rs/handle/123456789/714 | ISSN: | 0031-8949 | DOI: | 10.1088/1402-4896/aad749 |
Appears in Collections: | Journal Article |
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