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- Title
Influence of surface modified TiO nanoparticles on dielectric properties of PVdF-HFP nanocomposites.
- Authors
Prabakaran, K.; Mohanty, S.; Nayak, S.
- Abstract
Polyvinylidene fluoride-co-hexaflouropropylene (PVdF-HFP)/TiO hybrid nanocomposites membranes for electrical applications have been prepared using a solvent casting technique. The interface between PVdF-HFP and TiO was modified using aminopropyltrimethoxysilane (APS) coupling agent. The silane linkages on the TiO surface have been confirmed using Fourier transform infra red spectroscopy. WAXD and DSC analysis has been employed to estimate the variation in crystallinity within the membrane as a function of the incorporation of both untreated and APS treated TiO. The dispersion of both nanoparticles in the PVdF-HFP matrix were characterized by atomic force microscopy and differences were observed in the images of APS treated and untreated. Variation in electrical properties such as conductivity, dielectric constant, dielectric loss and electric modulus of the hybrid composite films were studied employing AC impedance spectroscopy over a range of frequency from 1 kHz to 1 MHz at room temperature. Theoretical models like Maxwell, Faruka, Rayleigh and Lichtenecker were employed to calculate the effective dielectric constant of hybrid nanocomposite membranes and the estimated values were compared with the experimental data. Further, the variation in thermal stability of PVdF-HFP membrane as a function of untreated and silane treated TiO reinforcement has been estimated using thermogravimetric analysis.
- Subjects
TITANIUM oxides; ELECTRIC properties of nanoparticles; POLYVINYLIDENE fluoride; PROPENE; NANOCOMPOSITE materials; CASTING (Fishing); THERMOGRAVIMETRY
- Publication
Journal of Materials Science: Materials in Electronics, 2014, Vol 25, Issue 10, p4590
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-014-2209-3