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Electrical properties of the DGEBA/PANI-Ag composites

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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.

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Acknowledgments

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

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Authors and Affiliations

  1. Departamento de Física e Química, Instituto de Ciências Exatas, Universidade Federal de Itajubá (UNIFEI), Av. BPS, 1303, Bairro Pinheirinho, Itajubá, MG, CEP 37500-903, Brazil

    Maria Elena Leyva, Filiberto González Garcia, Alvaro Antonio Alencar de Queiroz & Demétrio Artur Werner Soares

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  1. Maria Elena Leyva
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  2. Filiberto González Garcia
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  3. Alvaro Antonio Alencar de Queiroz
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  4. Demétrio Artur Werner Soares
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Correspondence to Maria Elena Leyva.

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Leyva, M.E., Garcia, F.G., de Queiroz, A.A.A. et al. Electrical properties of the DGEBA/PANI-Ag composites. J Mater Sci: Mater Electron 22, 376–383 (2011). https://doi.org/10.1007/s10854-010-0146-3

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