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<p>This study presents the fabrication and characterization of polyester-based hybrid composites reinforced with silane-treated Bambusa Hampi fiber and silane-modified bioceramic Si<sub>3</sub>N<sub>4</sub> filler derived from Jowar millet husk. The composites were evaluated for mechanical, dielectric, and electromagnetic interference (EMI) shielding behavior across X- and Ku-band frequencies. Specimen PFB3 showed the best mechanical performance due to uniform filler dispersion and strong fiber–matrix adhesion, enabling efficient stress transfer and crack resistance. In contrast, specimen PFB5 exhibited superior dielectric properties and EMI shielding effectiveness, attributed to enhanced interfacial polarization, higher permittivity, and multiple scattering pathways within the hybrid network. SEM analysis confirmed these findings, showing fiber pull-out in PF, uniform filler dispersion in PFB3, and localized agglomeration in PFB5. Overall, PFB3 is optimal for structural applications, while PFB5 is better suited for dielectric and EMI shielding functions.</p>

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Fabrication and multifunctional characterization of Bambusa Hampi fiber–bioceramic hybrid polyester composites for X- and Ku-band electromagnetic shielding applications

  • 期刊论文

  • 发表日期：

    2026年8月1日

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  • R. Sivaraman,
  • D. R Srinivasan,
  • Dhandapani Sendil Kumar,
  • Yousef A. Baker El Ebiary,
  • S. Sivasaravanan,
  • A. Sai Kumar,
  • N. Nagabhooshanam,
  • Nakka Rajeswara Rao,
  • Siva Krishna

摘要

This study presents the fabrication and characterization of polyester-based hybrid composites reinforced with silane-treated Bambusa Hampi fiber and silane-modified bioceramic Si3N4 filler derived from Jowar millet husk. The composites were evaluated for mechanical, dielectric, and electromagnetic interference (EMI) shielding behavior across X- and Ku-band frequencies. Specimen PFB3 showed the best mechanical performance due to uniform filler dispersion and strong fiber–matrix adhesion, enabling efficient stress transfer and crack resistance. In contrast, specimen PFB5 exhibited superior dielectric properties and EMI shielding effectiveness, attributed to enhanced interfacial polarization, higher permittivity, and multiple scattering pathways within the hybrid network. SEM analysis confirmed these findings, showing fiber pull-out in PF, uniform filler dispersion in PFB3, and localized agglomeration in PFB5. Overall, PFB3 is optimal for structural applications, while PFB5 is better suited for dielectric and EMI shielding functions.