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Electrical properties of the DGEBA/PANI-Ag composites

  • Maria Elena Leyva
  • Filiberto González Garcia
  • Alvaro Antonio Alencar de Queiroz
  • Demétrio Artur Werner Soares
Article

Abstract

The metallopolymer polyaniline-silver (PANI-Ag) was synthesized and used as conductive filler in crosslinked diglycidyl ether of bisphenol A (DGEBA) epoxy network. The hybrid organic/inorganic PANI-Ag powders were successfully synthesized via in situ chemical oxidation of polyaniline-emeraldine base (PANI-EB) by the capped Ag+ on the polyaniline-emeraldine base (PANI-EB) surface. The UV–Vis and FT-IR spectra confirmed the pernigraniline structure (PN) of PANI in the hybrid PANI-Ag. The PANI-Ag dispersion in epoxidic matrix was analyzed by optical microscopy (OM). The images analysis from OM showed that the particle agglomerate size of the metallopolymer increased with increasing PANI-Ag concentration in the DGEBA composite, owing to the aggregation effect. The dc conductivity and impedance spectroscopy of the DGEBA/PANI-Ag composite was measured at different PANI-Ag concentrations in the DGEBA network. The electrical dc conductivity of the PANI-Ag was 35.1 S cm−1 and was dependent of the PANI-Ag concentration in DGEBA matrix. The real and imaginary part of impedance complex measurements indicates a strong interfacial polarization at low frequency for both PANI-Ag and DGEBA/PANI-Ag, respectively. The imaginary part of impedance complex Im(Z) data decrease with the PANI-Ag hybrid concentration in the frequencies range of 102–106 Hz. The dependence of the Im(Z) on the frequency exhibited a relaxation process in both, PANI-Ag and DGEBA/PANI-Ag composite with 10 phr of PANI-Ag powder.

Keywords

PANI Silver Nanoparticles Diglycidyl Ether Pure PANI Emeraldine Base 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The authors would like to thank CNPq, Finep and Fapemig for the financial support.

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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • Maria Elena Leyva
    • 1
  • Filiberto González Garcia
    • 1
  • Alvaro Antonio Alencar de Queiroz
    • 1
  • Demétrio Artur Werner Soares
    • 1
  1. 1.Departamento de Física e Química, Instituto de Ciências ExatasUniversidade Federal de Itajubá (UNIFEI)ItajubáBrazil

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