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

Abstract

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.

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DBSA doped polypyrrole blended with Poly(4-styrenesulfonic acid) by mechanical mixing

Abstract

DBSA doped polypyrrole was prepared by In-situ chemical oxidative polymerization method. The reaction temperature was 0 to 20 °C. Different weight percentages of PSS (40 wt.%, 60 wt.% and 80 wt.%) were mechanically blended with a pestle in an agate mortar for 25 minutes by solid state mixing. The investigation of the blend focused on the optical, structural and morphological properties. SEM micrographs indicated that PSS was homogeneously distributed within DBSA doped PPy. FT-IR study confirmed the doped and blended dopants in the composite structure. UV-study revealed the π → π* transition in benzenoid rings of DBSA and presence of PSS. The semi-crystalline nature of the composites improved with increasing the weight percentage of PSS.

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Electrical Properties of PPy-Coated Conductive Fabrics for Human Joint Motion Monitoring

, Lorussi F, Mazzoldi A, De Rossi D. Strain-sensing fabrics for wearable kinaesthetic-like systems. Ieee Sensors Journal, 2003, 3(4):460-467. [8] Li Y, Cheng XY, Leung MY, Tsang J, Tao XM, Yuen CWM. A flexible strain sensor from polypyrrole-coated fabrics. Synthetic Metals, 2005, 155 (1):89-94. [9] Wu J, Zhou D, Too CO, Wallace GG. Conducting polymer coated lycra. Synthetic Metals,2005 155 (3):698-701 [10] Tokarska M, Gniotek K. Anisotropy of the electrical properties of flat textiles. Journal of the Textile Institute, 2015, 106 (1):9-18. [11

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The anticorrosion properties of pigments based on molybdates and tungstates surface-modified with conducting polymers

Abstract

The objective of this work was to examine the properties of molybdate or tungstate based pigments whose surface has been coated with a conductive polymer, viz. either polyaniline phosphate (PANI) or polypyrrole phosphate (PPY), if used as pigments in organic coating materials. The anticorrosion pigments were prepared by high-temperature solid-state synthesis from the respective oxides, carbonates. The composite pigments (pigment/conductive polymer) were dispersed in a solvent-type epoxy-ester resin binder to obtain a series of paints whose anticorrosion properties were assessed by means of corrosion tests in accelerated corrosion test and by the linear polarisation method. Focus was on the anticorrosion properties of the paints depending on the pigment surface treatment, initial pigment composition, and pigment volume concentration (PVC) in the paint. The surface-treated pigment particles were expected to have a favourable effect on the anticorrosion and the mechanical properties of epoxy-ester resin based paints.

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Structural and Morphological Investigations on Coreshell Hybrid Microparticles

References [1] Hideo Otaka, Michie Kira, Kentaro Yano, Shunichiro Ito, Hirofumi Mitekura, Toshio Kawata, Fumio Matsui, Multicolored dye-sensitized solar cells, Chemistry, Volume 164, Issues 1-3, pp. 67-73, 2004; [2] Dragoş-Viorel Brezoi, Rodica-Mariana Ion, Phase Evolution Induced by Polypyrrole in Iron Oxide - Polypyrrole Nanocomposite, Sensors and Actuators B: Chemicals, Vol. 109, Issue 1, 0925 - 4005, pg. 171-175, 2005; [3] Lorenzo Zolin, Lithium-Based Batteries, chapter in Largescale Production of Paper

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Influencing the anticorrosion efficiency of pigments based on zinc ferrite by conductive polymers

REFERENCES 1. Schauer T. et al. Protection of iron against corrosion with polyaniline primers, Progress in Organic Coatings 1998 , 33, 20-27. 2. Armelin E. et al. Corrosion protection with polyaniline and polypyrrole as anticorrosive additives for epoxy paint, Corrossion Science 2008 , 50, 721-728. 3. Yang X. et al. Anticorrosion performance of polyaniline nanostructures on mild steel, Progress in Organic Coatings 2010 , 69, 267-271. 4. Ebrahimi G. et al. Investigation on corrosion protection mechanism of polyaniline nanoparticles

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Effect of Nanofiller Dispersion on Morphology, Mechanical and Conducting Properties of Electroactive Shape Memory Poly(Urethane-Urea)/Functional Nanodiamond Composite

and properties, Iran. Polym. J. 23 (2014) 531-545. 25. Kausar A., Wajid-Ullah, Muhammad B., Siddiq M.: Novel Mechanically Stable, Heat Resistant and Non-flammable Functionalized Polystyrene/Expanded Graphite Nanocomposites, Adv. Mater. Sci. (2014) DOI: 10.2478/adms-2014-0022. 26. Meador M. N. B., Hardy-Green D., Auping J. V., Gaier J. R., Ferrara L. A., Papadopoulos D. S., Smith J. W., Keller D. J.: Optimization of electrically conductive films: Poly(3-methylthiophene) or polypyrrole in Kapton. J. Appl. Polym. Sci. 63 (1997) 821

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Synthesis, anticancer and cytostatic activity of some 6H-indolo[2,3-b]quinoxalines

.11.757. P. G. Baraldi, M. Del Carmen Nunez, M. A. Tabrizi, E. De Clercq, J. Balzarini, J. Bermejo, F. Este'vez and R. Romagnoli, Design, synthesis and biological evaluation of hybrid molecules containing α-methylene-γ-butyrolactones and polypyrrole minor groove binders, J. Med. Chem. 47 (2004) 2877-2886; DOI: 10.1021/jm031104y.

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PANI/NaTaO3 composite photocatalyst for enhanced hydrogen generation under UV light irradiation

.1016/j.jssc.2007.07.017. 12. Gangopadhyay, R. & De, A. (2000). Conducting polymer nanocomposites: A brief overview. Chem. Mater. 12, 608–622. DOI: 10.1021/cm990537f. 13. Kandiel, T.A., Dillert, R. & Bahnemann, D.W. (2009). Enhanced photocatalytic production of molecular hydrogen on TiO 2 modified with Pt-polypyrrole nanocomposites. Photochem. Photobiol. Sci. 8, 683–690. DOI: 10.1039/b817456c. 14. Zhang, S., Chen, Q., Jing, D., Wang, Y. & Guo, L. (2012). Visible photoactivity and antiphotocorrosion performance of PdS-CdS photocatalysts modified by

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Anticorrosive efficiency of alkyd resin-based coatings containing Mg–Zn–Fe mixed oxide-based pigments

A et al.. Corrosion protection with zinc-rich epoxy paint coatings embedded with various amounts of highly dispersed polypyrrole-deposited alumina monohydrate, Progress in Organic Coatings 2013 , 76, 17-32. 17. Sickafus K.E., Wills J.M., Grimes N.W. Structure of spinel, Journal of the American Ceramic Society 1999 , 82 (12), 3279-3292. 18. Giannakas A.E. et al. Surface properties, textural features and catalytic performance for NO + CO abatement of spinels MAl 2 O 4 (M = Mg, Co and Zn) developed by reverse and bicontinous microemulsion method

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