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<strong>Influence of Al2O3 nanoparticles on the dielectric properties and structural dynamics of PVA-PEO blend basednanocomposites</strong>

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Title Statement <strong>Influence of Al2O3 nanoparticles on the dielectric properties and structural dynamics of PVA-PEO blend basednanocomposites</strong>
 
Added Entry - Uncontrolled Name Choudhary, Shobhna ; 1. Dielectric Research Laboratory, Department of Physics, Jai Narain Vyas University, Jodhpur – 342 005, India 2. CSIR-National Institute of Science Communication and Information Resources, New Delhi – 110 012, India
 
Uncontrolled Index Term Polymernanocomposites; Dielectric properties; Electrical conductivity; Relaxation times; Activation energy; X-ray diffraction
 
Summary, etc. The organic-inorganic nanocomposite films comprising poly(vinyl alcohol) (PVA) and poly(ethylene oxide) (PEO) blend matrix dispersed with alumina (Al<sub>2</sub>O<sub>3</sub>) nanoparticles (i.e., (PVA-PEO)–<em>x</em>wt% Al<sub>2</sub>O<sub>3</sub>; <em>x</em> = 0, 1, 3 or 5) have been prepared by the solution-cast method. The X-ray diffraction study confirms a large decrease in crystalline phase of the PVA-PEO blend structures with the addition of 1 wt% Al<sub>2</sub>O<sub>3</sub>, and it decreases gradually with the further increase of Al<sub>2</sub>O<sub>3</sub> contents. Influence of Al<sub>2</sub>O<sub>3</sub> nanofiller on the complex dielectric permittivity, electrical conductivity, electric modulus and the impedance properties of these polymer nanocomposite (PNC) films have been investigated over the frequency range from 20 Hz to 1 MHz by employing the dielectric relaxation spectroscopy (DRS). The ambient temperature dielectric permittivity values of the PNC films decrease initially up to 3 wt% Al<sub>2</sub>O<sub>3 </sub> loading in the PVA-PEO blend matrix, whereas for 5 wt% Al<sub>2</sub>O<sub>3</sub>, it again increases and exceeds the value of pristine polymer blend film.The relaxation processes exhibited in the dielectric loss tangent and the loss part of electric modulus spectra reveal that the polymers cooperative chain segmental motion enhances in the presence of Al<sub>2</sub>O<sub>3</sub> nanoparticles in the PVA-PEO blend structures. Further, it has been found that the values of dielectric permittivity increase whereas the relaxation time decreases with the increase of temperature of the (PVA-PEO)–3 wt% Al<sub>2</sub>O<sub>3 </sub> film from 27 to 60°C. The dielectric and electrical parameters of the PNC films have been analyzed in regards to their suitability as flexible-type novel nanodielectric material for the electrical insulation, the dielectric substrate in the fabrication of high performance organic microelectronic devices, and also in the preparation of nanocomposite solid polymer electrolytes (NSPEs) for the energy storing devices.
 
Publication, Distribution, Etc. Indian Journal of Chemical Technology (IJCT)
2018-07-05 13:43:53
 
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http://op.niscair.res.in/index.php/IJCT/article/view/18862
 
Data Source Entry Indian Journal of Chemical Technology (IJCT); ##issue.vol## 25, ##issue.no## 1 (2018): Indian Journal of Chemical Technology
 
Language Note en