The enhancement of the oxidation resistance of carbonyl iron by polyaniline coating and consequent changes in electromagnetic properties |
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Authors: | Madina A. Abshinova,Petr Sá ha,Jana Ková ?ová |
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Affiliation: | a Polymer Centre, Faculty of Technology, Tomas Bata University in Zlin, 762 72 Zlin, Czech Republic b Institute of Radio-Engineering and Electronics, Russian Academy of Sciences, Fryazino, Moscow region 141190, Russian Federation c Institute of Macromolecular Compounds, Russian Academy of Sciences, St. Petersburg 199004, Russian Federation d Ioffe Physico-Technical Institute, Russian Academy of Sciences, St. Petersburg 194021, Russian Federation e Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, 162 06 Prague 6, Czech Republic |
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Abstract: | In order to enhance the stability of commercially unmodified processed carbonyl iron (CI) and to prevent corrosion, CI powders were coated with polyaniline (PANI) by using surfactant-stabilized PANI colloids in chloroform. PANI coats the individual particles with a film of a few micrometres thickness. Electromagnetic properties, as well as thermal and storage stability, of polymer composites filled with pristine and PANI-coated CI have been studied. The PANI overlayer has negligible influence on the magnetic and dielectric spectra of CI-filled polymer composites at ambient temperature. However, the temperature-frequency study of complex permittivity demonstrated that the composites containing PANI-coated CI powders are characterized by temperature-independent dielectric spectra, whereas the complex permittivity of polymer composites with pristine powders drastically decreased at elevated temperature. Additionally, the thermogravimetric analysis of pristine and PANI-coated CI powders in air has shown improvement in the stability. PANI overlayer prevents the oxidation of particles and acts as corrosion protection of CI. |
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Keywords: | Carbonyl iron Polyaniline Conducting polymer Corrosion protection Magnetic permeability Dielectric permittivity |
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