Wyniki wyszukiwania - BazTech

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Structural analysis and dielectric relaxation mechanism of conducting polymer/volcanic basalt rock composites

Bulgurcuoğlu Ayşe Evrim, Karabul Yaşar, Kiliç Mehmet, Özdemir Zeynep Güven, Erdönmez Seda, Misirlioğlu Banu Süngü, Okutan Mustafa, İçelli Orhan

Materials Science Poland

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2019

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Vol. 37, No. 3

353--363

EN

In this work, polypyrrole and polythiophene conducting polymers (CPs) have been synthesized and doped with volcanic basalt rock (VBR) in order to improve their dielectric properties for technological applications. The structure and morphology of the composites with different VBR doping concentrations were characterized by FT-IR and SEM analyses. The best charge storage ability was achieved for maximum VBR doping concentration (50.0 wt.%) for both CPs. Dielectric relaxation types of the composites were determined as non-Debye type due to non-zero absorption coefficient and observation of semicircles whose centers were below Z′ axis at the Nyquist plots. It was also ascertained that VBR doping makes the molecular orientation easier than for non-doped samples and reduced energy requirement of molecular orientation. In addition, AC conductivity was totally masked by DC conductivity for all samples at low frequency.

2

Electrochemical behavior and conductivity measurements of electropolymerized selenophene-based copolymers

Alakhras F.

Materials Science Poland

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2015

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Vol. 33, No. 1

25--35

EN

Electrochemical copolymerization of selenophene and thiophene was performed at a constant electrode potential. The obtained homopolymer films and copolymers were studied and characterized with cyclic voltammetry and conductivity measurements, from which conductivity values around 13.35 S cm-1 were determined. The influence of the applied electropolymerization potential and the monomer feed ratio of selenophene and thiophene on the copolymers properties was investigated. The obtained copolymers showed good stability of the redox activity in an acetonitrile-based electrolyte solution. At higher polymerization potentials and at higher concentrations of thiophene in the feed, more thiophene units were incorporated into the copolymer chain. The conductivities of the copolymers were between those of homopolymers, implying that oxidation of both monomers was possible and the copolymer chains might accordingly be composed of both selenophene and thiophene units.

3

Emulsion polymerization of thiophene – the new way of conducting polymers synthesis

Nowaczyk J., Kadac K., Olewnik-Kruszkowska E.

Advances in Science and Technology. Research Journal

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2015

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Vol. 9, nr 27

118--122

EN

The aim of this study was to investigate the new method of polythiophene polymerization. It was made an attempt of the chemical oxidation of thiophene in aqueous medium without the addition of any surfactant. The oxidative compound applied in the synthesis was gaseous ozone. Resulting polymer was obtained in the form of nano-spheres dispersed in water. The method developed in this study allow to obtain the polythiophene nanoparticles. Further study is required to fully identify the resulting product properties in comparison with polymer obtained in other methods.