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<p>This study investigates the effect of processing methods on the electrical characteristics of graphene-modified polyurethane (PU) foam-epoxy composites. Two different fabrication approaches were employed: graphene coating on PU foam followed by epoxy infusion (GCPE method) and direct mixing of graphene into the epoxy matrix before PU foam infusion (GFPE method). The influence of graphene dispersion on electrical conductivity and dielectric behavior was systematically analyzed. Results indicate that GCPE method is more effective and showed better electrical conductivity compared to GFPE composites whereas dielectric constant measurements reveal reverse trends. Mechanism is also proposed herein to understand the phenomenon and supported the difference found between the two fabrication methods. This strategy emphasizes the critical role of processing techniques in fabricating foam-based epoxy composites. Morphological analysis was carried out using FESEM and optical microscope.</p>

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Effect of Processing on Electrical Characteristics of Graphene-Modified PU Foam-Epoxy Composites

  • 期刊论文

  • 发表日期：

    2025年9月15日

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  • Monika Chaparia,
  • Shaily Bhargava,
  • Anil Dhawan,
  • Umesh Kumar Dwivedi

摘要

This study investigates the effect of processing methods on the electrical characteristics of graphene-modified polyurethane (PU) foam-epoxy composites. Two different fabrication approaches were employed: graphene coating on PU foam followed by epoxy infusion (GCPE method) and direct mixing of graphene into the epoxy matrix before PU foam infusion (GFPE method). The influence of graphene dispersion on electrical conductivity and dielectric behavior was systematically analyzed. Results indicate that GCPE method is more effective and showed better electrical conductivity compared to GFPE composites whereas dielectric constant measurements reveal reverse trends. Mechanism is also proposed herein to understand the phenomenon and supported the difference found between the two fabrication methods. This strategy emphasizes the critical role of processing techniques in fabricating foam-based epoxy composites. Morphological analysis was carried out using FESEM and optical microscope.