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<p>This study investigates the electrical transport mechanisms of a novel pentafunctional epoxy resin, namely pentaglycidyl ether pentabisphenol A of phosphorus (PGEPBAP), cross-linked with methylenedianiline (MDA). Structural and microscopic analyses were conducted using x-ray diffraction (XRD), scanning electron microscopy/energy-dispersive x-ray spectroscopy (SEM-EDS), and Fourier transform infrared (FTIR) spectroscopy. The amorphous cross-linked polymer exhibits ultraviolet–visible (UV–Vis) absorption and reflectance spectra. The bandgap energy and refractive index were calculated using the Tauc and Kubelka–Munk functions. The electrical properties were measured from 100 Hz to 1 MHz at temperatures ranging from 200 K to 400 K. The AC conductivity follows Jonscher’s power law. Analysis of the temperature dependence of the exponent <i>s</i>(<i>T</i>) revealed that the conduction mechanism in this polymer is associated with barrier hopping. Consequently, the binding energy <i>W</i><sub>m</sub> and minimum hopping distance <i>R</i><sub>min</sub> were determined. The electric modulus spectra were fitted using the Havriliak–Negami model. Furthermore, the temperature effects on the relaxation time and direct DC conductivity were analyzed using the Arrhenius equation.</p>

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Electrical Transport Mechanisms of a Cross-linked Polymer-Based Pentafunctional Epoxy Resin

  • 期刊论文

  • 发表日期：

    2025年10月14日

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  • I. El Fengouchi,
  • F. Ztak,
  • R. Hsissou,
  • L. C. Costa,
  • A. Narjis,
  • M. P. F. Graça,
  • M. El Hasnaoui

摘要

This study investigates the electrical transport mechanisms of a novel pentafunctional epoxy resin, namely pentaglycidyl ether pentabisphenol A of phosphorus (PGEPBAP), cross-linked with methylenedianiline (MDA). Structural and microscopic analyses were conducted using x-ray diffraction (XRD), scanning electron microscopy/energy-dispersive x-ray spectroscopy (SEM-EDS), and Fourier transform infrared (FTIR) spectroscopy. The amorphous cross-linked polymer exhibits ultraviolet–visible (UV–Vis) absorption and reflectance spectra. The bandgap energy and refractive index were calculated using the Tauc and Kubelka–Munk functions. The electrical properties were measured from 100 Hz to 1 MHz at temperatures ranging from 200 K to 400 K. The AC conductivity follows Jonscher’s power law. Analysis of the temperature dependence of the exponent s(T) revealed that the conduction mechanism in this polymer is associated with barrier hopping. Consequently, the binding energy Wm and minimum hopping distance Rmin were determined. The electric modulus spectra were fitted using the Havriliak–Negami model. Furthermore, the temperature effects on the relaxation time and direct DC conductivity were analyzed using the Arrhenius equation.