Electrical properties of the DGEBA/PANI-Ag composites

• Published in: Journal of materials science. Materials in electronics 2011-04, Vol.22 (4), p.376-383
• Main Authors: Leyva, Maria Elena, Garcia, Filiberto González, de Queiroz, Alvaro Antonio Alencar, Soares, Demétrio Artur Werner
• Format: Article
• Language: English
• Subjects: Applied sciences; Characterization and Evaluation of Materials; Chemistry and Materials Science; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Corrosion; Corrosion mechanisms; Electrical, magnetic and optical properties; Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures; Electronic transport in multilayers, nanoscale materials and structures; Exact sciences and technology; Fullerenes and related materials; Infrared and raman spectra and scattering; Materials Science; Metals. Metallurgy; Optical and Electronic Materials; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Organic polymers; Physicochemistry of polymers; Physics; Properties and characterization
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-010-0146-3

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 10 2 –10 6  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.