DC conductivity study of polyaniline and poly(acrylonitrile-butadiene-styrene) blends (original) (raw)
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Interest in applications for polyaniline (PANI) has motivated investigators to study its mechanical properties, the thermostability of its conductivity, its processibility, etc. and its use in polymer composites or blends with common polymers. As a result, several methods to produce composites/blends containing PANI have been developed, allowing the preparation of a wide spectrum of such materials. Here, generalized approaches for the preparation of such materials are reviewed. Specifically, we consider two distinct groups of synthetic methods based on aniline polymerization either (1) in the presence of or inside a matrix polymer or (2) the blending of a previously prepared PANI with a matrix polymer. Some aspects of these methods are analyzed, emphasizing features that determine properties of the final composites/blends.
Dielectric Constant and Transport Mechanism of Percolated Polyaniline Nanoclay Composites.
We report the dielectric constant and transport mechanism of intercalated nanoclay−polyaniline composite, an industrially ready to use novel nanocomposite, which is prepared by a simple mechanochemical method. The effects of clay concentration on structure and structure variations on properties were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, thermogravimetric analysis, and impedance spectroscopy (20 Hz−1 MHz and temperature range from 300−380 K). The phenomenon of percolation was observed in these composites. The values of Mott’s temperature, density of states at the Fermi level, hopping distance, and barrier height for polyaniline−nanoclay (PANC) composites were calculated. By applying Mott’s theory, it is found that the PANC composites obey the one-dimensional variable range hopping mechanism. This type of percolated sample can be used as a nanocapacitor in many devices because of its enhanced transport properties.
Hopping conduction and dielectric properties of InSb bulk crystal
The conduction mechanism in InSb crystals has been investigated by means of dc and ac conductivity measurements. The temperature-dependent electrical conductivity analysis revealed the dominance of the thermionic emission and the variable range hopping (VRH) of charged carriers above and below 325 K, respectively. The Mott's temperature T0, the density of states at the Fermi level N (Ef), the average hopping distance Rhop and the barrier height Whop have been calculated for the obtained InSb crystals. The ac electrical conduction as a function of frequency analysis suggests that ac conduction is attributed to correlated barrier hopping (CBH) model. There is a significant increase with temperature at low frequencies in the dielectric constant due to increase in contribution from space charge polarization with temperature