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<p>The increasing need for sustainable and multifunctional materials in structural and electronic applications has prompted the exploration of natural fiber-based composites with enhanced electromagnetic interference (EMI) shielding and dielectric properties. However, conventional bio-composites often suffer from limited electrical performance, restricting their use in EMI-sensitive environments. This study addresses this challenge by developing vinyl ester composites reinforced with 40 vol.% snake plant fiber and varying contents (1–5 vol.%) of activated biocarbon derived from biomass waste. Among the developed composites, VSB1 (3 vol.% biocarbon) showed superior mechanical performance, with a tensile strength of 147&#xa0;MPa, flexural strength of 168&#xa0;MPa, and impact strength of 4.9&#xa0;J, attributed to effective stress transfer from fiber reinforcement and matrix stiffening by biocarbon. VSB2 (5 vol.% biocarbon) demonstrated enhanced functional properties, including a Shore-D hardness of 93 and total EMI shielding effectiveness up to 3.0&#xa0;dB at 8&#xa0;GHz, primarily driven by absorption through interfacial polarization, conductive loss, and multiple scattering. It also exhibited excellent dielectric behavior, with a permittivity of 4.56 and loss of 0.94, due to improved conductivity and polarization effects. These results underscore the potential of snake plant fiber/biocarbon hybrids as sustainable materials for EMI shielding and dielectric applications in electronic device casings, automotive electronics, aerospace components, and telecommunication equipment.</p>

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Electromagnetic interference shielding behavior of sustainable polymeric composite with domestically discarded biomass waste

  • 期刊论文

  • 发表日期：

    2025年7月18日

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  • K. Periyarselvam,
  • N. Suresh,
  • M. Prabhu,
  • P. Sivakumar

摘要

The increasing need for sustainable and multifunctional materials in structural and electronic applications has prompted the exploration of natural fiber-based composites with enhanced electromagnetic interference (EMI) shielding and dielectric properties. However, conventional bio-composites often suffer from limited electrical performance, restricting their use in EMI-sensitive environments. This study addresses this challenge by developing vinyl ester composites reinforced with 40 vol.% snake plant fiber and varying contents (1–5 vol.%) of activated biocarbon derived from biomass waste. Among the developed composites, VSB1 (3 vol.% biocarbon) showed superior mechanical performance, with a tensile strength of 147 MPa, flexural strength of 168 MPa, and impact strength of 4.9 J, attributed to effective stress transfer from fiber reinforcement and matrix stiffening by biocarbon. VSB2 (5 vol.% biocarbon) demonstrated enhanced functional properties, including a Shore-D hardness of 93 and total EMI shielding effectiveness up to 3.0 dB at 8 GHz, primarily driven by absorption through interfacial polarization, conductive loss, and multiple scattering. It also exhibited excellent dielectric behavior, with a permittivity of 4.56 and loss of 0.94, due to improved conductivity and polarization effects. These results underscore the potential of snake plant fiber/biocarbon hybrids as sustainable materials for EMI shielding and dielectric applications in electronic device casings, automotive electronics, aerospace components, and telecommunication equipment.