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<p>In this investigation, hybrid composites based on polyvinyl alcohol (PVA) reinforced with basalt fiber and biocarbon filler were thoroughly tested for mechanical, dielectric, magnetic and electromagnetic interference shielding (EMI SE) performance. The main objective is how the biomass derived biofiller is influence in the improvement of load bearing as well as EMI shielding behaviour. According to the results, the addition of basalt fiber improved the mechanical performance and adding biocarbon filler improved the EMI effect. It is noted that a highest tensile strength of 143&#xa0;MPa is achieved for composite with 2 vol% of particle. Its balanced reinforcement and efficient stress distribution also resulted in superior EMI shielding effectiveness of 64.84 dB at 18&#xa0;GHz. On the other hand, composite with 4 vol% of biocarbon showed a highest permeability values with the highest dielectric permittivity of 4.8, making it ideal for uses that demand enhanced electromagnetic characteristics. Microstructural insights were also obtained by scanning electron microscopy (SEM) analysis, which showed pores in plain PVA, however in composite with fibre and filler no such defects identified. These properties improved lightweight flexible composites could be used as microwave absorbers in tele-communication, radar and satellite technology.</p>

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Evaluation of Dielectric, Magnetic, Mechanical and EMI Shielding Behaviors of Flexible PVA Composites Incorporated with Bio-Carbon Particles and Basalt Fiber

  • 期刊论文

  • 发表日期：

    2025年7月8日

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  • S. Mohanasundaram,
  • Dhandapany sendil Kumar,
  • S. Manoj Kumar,
  • Ch. Indira Priyadarsini,
  • B. Sachuthananthan,
  • N. Nagabhooshanam,
  • Varaprasad Bhemuni,
  • K. K. Yaswanth

摘要

In this investigation, hybrid composites based on polyvinyl alcohol (PVA) reinforced with basalt fiber and biocarbon filler were thoroughly tested for mechanical, dielectric, magnetic and electromagnetic interference shielding (EMI SE) performance. The main objective is how the biomass derived biofiller is influence in the improvement of load bearing as well as EMI shielding behaviour. According to the results, the addition of basalt fiber improved the mechanical performance and adding biocarbon filler improved the EMI effect. It is noted that a highest tensile strength of 143 MPa is achieved for composite with 2 vol% of particle. Its balanced reinforcement and efficient stress distribution also resulted in superior EMI shielding effectiveness of 64.84 dB at 18 GHz. On the other hand, composite with 4 vol% of biocarbon showed a highest permeability values with the highest dielectric permittivity of 4.8, making it ideal for uses that demand enhanced electromagnetic characteristics. Microstructural insights were also obtained by scanning electron microscopy (SEM) analysis, which showed pores in plain PVA, however in composite with fibre and filler no such defects identified. These properties improved lightweight flexible composites could be used as microwave absorbers in tele-communication, radar and satellite technology.