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<p>Upcycling waste materials is a key step towards a circular bioeconomy by reducing the reliance on virgin resources, maximizing resources efficiency and minimizing environmental impact. Sustainable materials aim to establish a circular bioeconomy to maximize resources efficiency and promote positive social and environmental impacts. This research investigates the development of eco-friendly thermal insulating sustainable composite using waste coir fibers and waste polypropylene. To enhance fiber-matrix adhesion and improve composite properties, coir fibers underwent alkaline treatment. Compression molding was employed to fabricate coir-fiber reinforced composite sheets with varying coir fiber loadings (30%, 35%, and 40%). The resulting composites exhibited enhanced thermal insulation properties, characterized by reduced thermal conductivity up to 0.10&#xa0;W/m.K, moderate specific heat capacity up to 1.8844&#xa0;J/g°.C and lower thermal diffusivity up to 5.28 × 10<sup>− 8</sup> m<sup>2</sup>/s, as fiber loading was increased. Moreover, the mechanical properties of tensile strength, tensile modulus, Charpy impact strength and drop weight impact strength were improved by 20%, 74%, 146% and 109%, respectively when coir fiber loading was increased from 30% to 40%. Higher mechanical properties and lower thermal properties demonstrate the potential of coir-fiber reinforced composite as a sustainable and high-performance thermal insulation material for domestic applications, contributing to waste upcycling, resource efficiency and environmental sustainability.</p> Graphical abstract <p></p>

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Waste-derived sustainable coir composites for thermal insulation applications with enhanced mechanical properties

  • 期刊论文

  • 发表日期：

    2025年12月26日

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  • Zakariya Zubair,
  • Mareeha Saif,
  • Imran Ali,
  • Muhammad Kashif Bangash,
  • Maurice N. Collins,
  • Syed Talha Ali Hamdani,
  • Muhammad Zeshan Ali

摘要

Upcycling waste materials is a key step towards a circular bioeconomy by reducing the reliance on virgin resources, maximizing resources efficiency and minimizing environmental impact. Sustainable materials aim to establish a circular bioeconomy to maximize resources efficiency and promote positive social and environmental impacts. This research investigates the development of eco-friendly thermal insulating sustainable composite using waste coir fibers and waste polypropylene. To enhance fiber-matrix adhesion and improve composite properties, coir fibers underwent alkaline treatment. Compression molding was employed to fabricate coir-fiber reinforced composite sheets with varying coir fiber loadings (30%, 35%, and 40%). The resulting composites exhibited enhanced thermal insulation properties, characterized by reduced thermal conductivity up to 0.10 W/m.K, moderate specific heat capacity up to 1.8844 J/g°.C and lower thermal diffusivity up to 5.28 × 10− 8 m2/s, as fiber loading was increased. Moreover, the mechanical properties of tensile strength, tensile modulus, Charpy impact strength and drop weight impact strength were improved by 20%, 74%, 146% and 109%, respectively when coir fiber loading was increased from 30% to 40%. Higher mechanical properties and lower thermal properties demonstrate the potential of coir-fiber reinforced composite as a sustainable and high-performance thermal insulation material for domestic applications, contributing to waste upcycling, resource efficiency and environmental sustainability.

Graphical abstract