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<p>PVDF-based syntactic foams reinforced with multiwalled carbon nanotubes (MWCNTs) and hollow glass microspheres were synthesized via a simple solution casting method to enhance electromagnetic interference (EMI) shielding performance. Addition of HGM enables uniform MWCNT dispersion within the polymer matrix in addition to drastically reducing the bulk density (i.e., ~ 0.18&#xa0;g/cm<sup>3</sup>) as compared to pure PVDF. HGM also aids multiple internal reflections within the bulk polymer, thereby enhancing the EMI attenuation. MWCNTs establish interconnected conductive networks within the PVDF matrix improved electrical conductivity and dielectric polarization. The syntactic foam achieved a maximum electrical conductivity of 5 S/cm and EMI shielding effectiveness (SE) of ~ 29.75&#xa0;dB at 14 wt% MWCNT loading with a thickness of ~ 1.6&#xa0;mm. The developed foams showed a thermal stability of ~ 450.87&#xa0;°C. Detailed analysis confirmed absorption-dominated shielding (&gt; 85%), attributed to conductive losses, interfacial polarization, and multiple scattering effects. This work offers a promising strategy for developing lightweight, flexible EMI shielding materials for aerospace, automotive, and wearable electronics, where low reflection and high absorption are critical.</p> Graphical abstract <p></p>

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Lightweight MWCNT-loaded PVDF-based syntactic foams with hollow glass microspheres for absorption-dominant EMI shielding

  • 期刊论文

  • 发表日期：

    2026年2月28日

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  • Salma Sultana,
  • Aabid Hussain Shaik,
  • Ariful Rahaman,
  • Mostafizur Rahaman,
  • Afzal Khan,
  • Mohammed Rehaan Chandan

摘要

PVDF-based syntactic foams reinforced with multiwalled carbon nanotubes (MWCNTs) and hollow glass microspheres were synthesized via a simple solution casting method to enhance electromagnetic interference (EMI) shielding performance. Addition of HGM enables uniform MWCNT dispersion within the polymer matrix in addition to drastically reducing the bulk density (i.e., ~ 0.18 g/cm3) as compared to pure PVDF. HGM also aids multiple internal reflections within the bulk polymer, thereby enhancing the EMI attenuation. MWCNTs establish interconnected conductive networks within the PVDF matrix improved electrical conductivity and dielectric polarization. The syntactic foam achieved a maximum electrical conductivity of 5 S/cm and EMI shielding effectiveness (SE) of ~ 29.75 dB at 14 wt% MWCNT loading with a thickness of ~ 1.6 mm. The developed foams showed a thermal stability of ~ 450.87 °C. Detailed analysis confirmed absorption-dominated shielding (> 85%), attributed to conductive losses, interfacial polarization, and multiple scattering effects. This work offers a promising strategy for developing lightweight, flexible EMI shielding materials for aerospace, automotive, and wearable electronics, where low reflection and high absorption are critical.

Graphical abstract