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<p>Direct pyrolysis of SnO<sub>2</sub> nanoparticles mixed with bisphenol-BA/aniline polybenzoxazine yields highly graphitized, Sn metal doped porous carbon material (Sn–C). The prepared Sn–C was used as a reinforcement for the development of composites with bisphenol-BA and furfuryl amine based polybenzoxazine (poly(BBA-ffa)). The maximum degradation temperature of the Sn–C reinforced poly(BBA-ffa) composites reached to 526&#xa0;°C with 65% char yield. The value of electrical conductivity of the prepared composites increased from 2.79 × 10<sup>−8</sup>&#xa0;S/m to 7.51 × 10<sup>−2</sup>&#xa0;S/m. Further, it was also observed that the developed composites possess the high dielectric behavior with increased value of dielectric constant from 3.47 to 10.05. The enhancement of electrical conductivity leads to the effective electromagnetic interference shielding of the polybenzoxazine composites. The highest weight percentage loading of Sn–C shows the EMI SE value of 33.23&#xa0;dB with shielding effectiveness of 99.95%. The developed polybenzoxazine composites can be utilized for high temperature resistant EMI shielding material.</p> Graphical abstract <p></p>

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Development of metal doped polybenzoxazine carbon containing high k composites for electromagnetic interference shielding

  • 期刊论文

  • 发表日期：

    2026年7月14日

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  • Harinei Srinivasan,
  • Hariharan Arumugam,
  • Alagar Muthukaruppan

摘要

Direct pyrolysis of SnO2 nanoparticles mixed with bisphenol-BA/aniline polybenzoxazine yields highly graphitized, Sn metal doped porous carbon material (Sn–C). The prepared Sn–C was used as a reinforcement for the development of composites with bisphenol-BA and furfuryl amine based polybenzoxazine (poly(BBA-ffa)). The maximum degradation temperature of the Sn–C reinforced poly(BBA-ffa) composites reached to 526 °C with 65% char yield. The value of electrical conductivity of the prepared composites increased from 2.79 × 10−8 S/m to 7.51 × 10−2 S/m. Further, it was also observed that the developed composites possess the high dielectric behavior with increased value of dielectric constant from 3.47 to 10.05. The enhancement of electrical conductivity leads to the effective electromagnetic interference shielding of the polybenzoxazine composites. The highest weight percentage loading of Sn–C shows the EMI SE value of 33.23 dB with shielding effectiveness of 99.95%. The developed polybenzoxazine composites can be utilized for high temperature resistant EMI shielding material.

Graphical abstract