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<p>This study explored the creation of sustainable biocomposite films. It used the polyvinyl alcohol (PVA) reinforced with chitin (CH) extracted from shrimp shells and microcrystalline cellulose (MCC) extracted from alfa fibers (<i>Stipa tenacissima</i>). Both raw materials are renewable and biodegradable, offering potential for reducing dependence on petroleum-based plastics. These biocomposites feature semi-crystalline structures and strong intermolecular interactions, which indicate an effective molecular-level compatibility. MCC played a key role in improving morphological uniformity. It reinforced interfacial adhesion and created a tighter matrix. Thermal analysis revealed that CH enhances thermal stability. MCC amplifies this effect by decreasing thermal weight loss through enhanced interfacial interactions. UV–Vis spectroscopy demonstrated that CH substantially improves UV-blocking abilities, with MCC contributing to creating a more effective barrier effect. The addition of CH and MCC led to a significant drop in water absorption. Also, water contact angle measurements confirmed that surface hydrophobicity increased. Mechanical testing revealed notable enhancements in tensile strength, Young’s modulus, and elongation at break. The composites containing 50% and 30% chitin, with 10% MCC in the PVA matrix, demonstrated the best overall performance. These findings highlight the potential of CH and MCC as functional reinforcements for sustainable, high-performance biocomposite materials.</p>

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Physicochemical, optical, thermal, and mechanical evaluation of enhanced chitin-PVA-microcrystalline cellulose biocomposites

  • 期刊论文

  • 发表日期：

    2025年10月27日

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  • Alma Jandoubi,
  • Mehrzia Krimi,
  • Dorra Ghorbel,
  • Sami Boufi,
  • Quim Tarrés,
  • Rached Ben Hassen

摘要

This study explored the creation of sustainable biocomposite films. It used the polyvinyl alcohol (PVA) reinforced with chitin (CH) extracted from shrimp shells and microcrystalline cellulose (MCC) extracted from alfa fibers (Stipa tenacissima). Both raw materials are renewable and biodegradable, offering potential for reducing dependence on petroleum-based plastics. These biocomposites feature semi-crystalline structures and strong intermolecular interactions, which indicate an effective molecular-level compatibility. MCC played a key role in improving morphological uniformity. It reinforced interfacial adhesion and created a tighter matrix. Thermal analysis revealed that CH enhances thermal stability. MCC amplifies this effect by decreasing thermal weight loss through enhanced interfacial interactions. UV–Vis spectroscopy demonstrated that CH substantially improves UV-blocking abilities, with MCC contributing to creating a more effective barrier effect. The addition of CH and MCC led to a significant drop in water absorption. Also, water contact angle measurements confirmed that surface hydrophobicity increased. Mechanical testing revealed notable enhancements in tensile strength, Young’s modulus, and elongation at break. The composites containing 50% and 30% chitin, with 10% MCC in the PVA matrix, demonstrated the best overall performance. These findings highlight the potential of CH and MCC as functional reinforcements for sustainable, high-performance biocomposite materials.