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<p>Chitosan was obtained from the chitin of shrimp shells by the deacetylation process. The chitosan was suspended in acetic acid to prepare the 1% (w/v) chitosan solution. Maleic acid (MA), poly (vinyl alcohol) (PVA), glycerol (Gly), and diethylene glycol (DEG) were used as plasticizers to cast a series of films. FTIR analysis provided evidence that the plasticizers physically reacted with chitosan without altering the chemical structure of chitosan. Notably, XRD and DSC analysis revealed that the plasticizers significantly disrupted the crystalline structure of chitosan, reducing its crystallinity index and Tg, and enhancing film flexibility. Furthermore, all the plasticized films showed drastic transparency onsets and adjustable optical band gaps (&gt; 3.0&#xa0;eV). The most significant result is that maleic acid was found to be an excellent plasticizer, providing films with maximum homogeneity, greatest flexibility, and good transparency. Such fine-tuned properties, combined with the intrinsic UV-barrier function, flexibility, and high transparency, have led to serious consideration of these plasticized chitosan films as ideal and sustainable materials for emerging applications, such as biodegradable food packaging, where product visibility and spoilage protection are required simultaneously.</p>

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Thermal and optical properties of characterized plasticized chitosan films

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月9日

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  • Hadi Salman Al-Lami,
  • Basil Ali Abdullah,
  • Sara Hikmet Mutasher

摘要

Chitosan was obtained from the chitin of shrimp shells by the deacetylation process. The chitosan was suspended in acetic acid to prepare the 1% (w/v) chitosan solution. Maleic acid (MA), poly (vinyl alcohol) (PVA), glycerol (Gly), and diethylene glycol (DEG) were used as plasticizers to cast a series of films. FTIR analysis provided evidence that the plasticizers physically reacted with chitosan without altering the chemical structure of chitosan. Notably, XRD and DSC analysis revealed that the plasticizers significantly disrupted the crystalline structure of chitosan, reducing its crystallinity index and Tg, and enhancing film flexibility. Furthermore, all the plasticized films showed drastic transparency onsets and adjustable optical band gaps (> 3.0 eV). The most significant result is that maleic acid was found to be an excellent plasticizer, providing films with maximum homogeneity, greatest flexibility, and good transparency. Such fine-tuned properties, combined with the intrinsic UV-barrier function, flexibility, and high transparency, have led to serious consideration of these plasticized chitosan films as ideal and sustainable materials for emerging applications, such as biodegradable food packaging, where product visibility and spoilage protection are required simultaneously.