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<p><?tk 4?>In this study, a novel lightweight polymer composite was developed using mineral fibers and activated bio-carbon as reinforcement materials, aiming to enhance multifunctional performance for electromagnetic interference (EMI) shielding applications. The composites were fabricated by the hand layup method, and the strength features were evaluated according to ASTM standards. The optimized VBB2 composite, reinforced with 40 vol% basalt fiber and 2 vol% activated bio-carbon, showed a 52.38% increase in tensile strength and a 42.45% improvement in flexural strength compared with the neat vinyl ester composite (V), confirming effective dispersion and strong interfacial bonding. At a higher bio-carbon loading of 5 vol% (VBB3), hardness improved to 91 Shore D, while tensile and flexural strengths decreased slightly, highlighting the trade-off between stiffness and strength. Importantly, VBB3 exhibited the highest dielectric constant (4.5) and loss (0.98) due to enhanced interfacial polarization, leading to superior EMI shielding performance. Shielding effectiveness increased with both frequency and filler loading, with absorption values of 57.4 dB at 8&#xa0;GHz and 82.3 dB at 20&#xa0;GHz, reflection values of 10.4 dB and 14.2 dB, and total effectiveness of 65.9 dB and 94.8 dB at the respective frequencies. These results demonstrate that combining basalt fiber for mechanical integrity with sustainable bio-carbon for dielectric enhancement offers a novel reinforcement strategy that achieves both high mechanical strength and outstanding EMI shielding. The developed composites thus present a sustainable, lightweight, and multifunctional solution with strong potential for aerospace, biomedical device, and wearable electronics applications.</p>

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Light weight shielding polymer composite by using mineral fiber and activated biocarbon and their evaluation of performance

  • 期刊论文

  • 发表日期：

    2025年12月5日

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  • L. Natrayan,
  • MaddurPedda Chennaiah,
  • Seeniappan Kaliappan,
  • T. Mothilal,
  • M. Ramya,
  • Sathish Kannan,
  • Vinayagam Mohanavel,
  • Manzoore Elahi M. Soudagar

摘要

In this study, a novel lightweight polymer composite was developed using mineral fibers and activated bio-carbon as reinforcement materials, aiming to enhance multifunctional performance for electromagnetic interference (EMI) shielding applications. The composites were fabricated by the hand layup method, and the strength features were evaluated according to ASTM standards. The optimized VBB2 composite, reinforced with 40 vol% basalt fiber and 2 vol% activated bio-carbon, showed a 52.38% increase in tensile strength and a 42.45% improvement in flexural strength compared with the neat vinyl ester composite (V), confirming effective dispersion and strong interfacial bonding. At a higher bio-carbon loading of 5 vol% (VBB3), hardness improved to 91 Shore D, while tensile and flexural strengths decreased slightly, highlighting the trade-off between stiffness and strength. Importantly, VBB3 exhibited the highest dielectric constant (4.5) and loss (0.98) due to enhanced interfacial polarization, leading to superior EMI shielding performance. Shielding effectiveness increased with both frequency and filler loading, with absorption values of 57.4 dB at 8 GHz and 82.3 dB at 20 GHz, reflection values of 10.4 dB and 14.2 dB, and total effectiveness of 65.9 dB and 94.8 dB at the respective frequencies. These results demonstrate that combining basalt fiber for mechanical integrity with sustainable bio-carbon for dielectric enhancement offers a novel reinforcement strategy that achieves both high mechanical strength and outstanding EMI shielding. The developed composites thus present a sustainable, lightweight, and multifunctional solution with strong potential for aerospace, biomedical device, and wearable electronics applications.