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The influence of vanadium pentoxide on the structure and dielectric properties of poly(vinyl alcohol)
Author(s) -
Mahmoud Waleed E,
AlGhamdi Ahmed A
Publication year - 2010
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.2866
Subject(s) - vinyl alcohol , materials science , dielectric , pentoxide , crystallinity , fourier transform infrared spectroscopy , vanadium , conductivity , relaxation (psychology) , permittivity , dielectric loss , polaron , polymer , polymer chemistry , composite material , analytical chemistry (journal) , chemical engineering , chemistry , organic chemistry , psychology , social psychology , physics , optoelectronics , quantum mechanics , electron , engineering , metallurgy
Polymers containing metal oxides of nanoscale dimensions have attracted attention because of their unique properties and new findings concerning technological applications. Polymers containing vanadium pentoxide (V 2 O 5 ) have attracted our interest in respect of their potential applications in memory and switching devices. Poly(vinyl alcohol) (PVA) containing different concentrations of V 2 O 5 ranging from 0 to 0.5 wt% were prepared. The synthesized PVA/V 2 O 5 composites were cast as self‐standing flexible films. The composites were characterized using X‐ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. An attempt was made to study the relaxation characteristics of PVA/V 2 O 5 samples. The permittivity and dielectric loss were determined as a function of V 2 O 5 concentration. The results show that the optimum concentration is 0.3 wt%. The electrical conductivity and dielectric modulus in the temperature range 303–433 K at various frequencies (10–100 kHz) for the optimum concentration were investigated. XRD and FTIR results show that the addition of V 2 O 5 reduces the crystallinity of PVA due to the interaction of vanadium ions with the OH groups of PVA. The application of the dielectric modulus formulism gives a simple method for evaluating the activation energy of the dielectric relaxation. The frequency dependence of the electrical conductivity follows the Jonscher universal dynamic law. The conductivity in the direct regime is described by the small polaron model. The electrical conductivity and dielectric properties show that Hunt's model is well adapted to PVA/V 2 O 5 films. Copyright © 2010 Society of Chemical Industry