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<p>The purpose of this experiment was to evaluate the effect of incorporating biochar into a polyester-based composite reinforced with lyocell bamboo fiber. Biochar was successfully extracted from peach pit husks through a pyrolysis process. Composite laminates were fabricated using the hand layup technique, and their properties were evaluated according to ASTM standards. The mechanical properties assessed included tensile, flexural, impact, surface hardness, and edgewise compression strengths, along with thermal conductivity and water absorption behaviour. Among all the specimens, the PB3 composite (containing 40&#xa0;vol.% lyocell bamboo fiber and 3&#xa0;vol.% biochar) exhibited the highest mechanical performance, recording tensile strength of 37.85&#xa0;N/mm<sup>2</sup>, flexural strength of 158.67&#xa0;N/mm<sup>2</sup>, impact strength of 3.4&#xa0;J, surface hardness of 78.20 Shore-D, and edgewise compressive strength of 43.23&#xa0;N/mm<sup>2</sup>. The failure mechanisms were further investigated through scanning electron microscopy (SEM) analysis. In addition, PB3 also demonstrated the highest thermal conductivity of 0.51&#xa0;W/mK. Meanwhile, the PB5 composite (40&#xa0;vol.% bamboo +5&#xa0;vol.% biochar) recorded the lowest water absorption at 0.50%, attributed to the hydrophobic and carbon-rich aromatic nature of biochar. With their excellent mechanical properties, low water absorption, and enhanced thermal conductivity, these bamboo/biochar reinforced composites show strong potential for applications in automotive components, sporting goods, military equipment, and various household and structural engineering fields.</p>

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Influence of Biochar Content on the Mechanical, Thermal conductivity, and Water absorption Properties of Lyocell Bamboo Fiber Reinforced Polyester Composites

  • 期刊论文

  • 发表日期：

    2026年2月23日

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  • V. Chidambaram,
  • D Jayabalakrishnan,
  • Seeniappan Kaliappan,
  • L. Natrayan

摘要

The purpose of this experiment was to evaluate the effect of incorporating biochar into a polyester-based composite reinforced with lyocell bamboo fiber. Biochar was successfully extracted from peach pit husks through a pyrolysis process. Composite laminates were fabricated using the hand layup technique, and their properties were evaluated according to ASTM standards. The mechanical properties assessed included tensile, flexural, impact, surface hardness, and edgewise compression strengths, along with thermal conductivity and water absorption behaviour. Among all the specimens, the PB3 composite (containing 40 vol.% lyocell bamboo fiber and 3 vol.% biochar) exhibited the highest mechanical performance, recording tensile strength of 37.85 N/mm2, flexural strength of 158.67 N/mm2, impact strength of 3.4 J, surface hardness of 78.20 Shore-D, and edgewise compressive strength of 43.23 N/mm2. The failure mechanisms were further investigated through scanning electron microscopy (SEM) analysis. In addition, PB3 also demonstrated the highest thermal conductivity of 0.51 W/mK. Meanwhile, the PB5 composite (40 vol.% bamboo +5 vol.% biochar) recorded the lowest water absorption at 0.50%, attributed to the hydrophobic and carbon-rich aromatic nature of biochar. With their excellent mechanical properties, low water absorption, and enhanced thermal conductivity, these bamboo/biochar reinforced composites show strong potential for applications in automotive components, sporting goods, military equipment, and various household and structural engineering fields.