Structural and electrical properties of ferroelectric poly(vinylidene fluoride) and mechanically activated ZnO nanoparticle composite films
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Aleksić, Obrad S.
Pavlović, Vera P.
Blagojević, Vladimir A.
Pavlović, Vladimir B.
Article (Published version)
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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 activate...d 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. © 2018 IOP Publishing Ltd.
Keywords:crystallization / dielectric properties / mechanical activation / polymer composites / PVDF / ZnO
Source:Physica Scripta, 2018, 93, 105801-
- IOP Publishing
- Size-, shape- and structure- dependent properties of nanoparticles and nanocomposites (RS-172056)
- Directed synthesis, structure and properties of multifunctional materials (RS-172057)
- United States National Science Foundation (NSF) / Centers of Research Excellence in Science and Technology (CREST), Grant HRD-0833184
- United States National Aeronautics and Space Administration (NASA), Grant NNX09AV07A