Extremely strong and tough chitosan films mediated by unique hydrated chitosan crystal structures,Materials Today

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Extremely strong and tough chitosan films mediated by unique hydrated chitosan crystal structures
Materials Today ( IF 21.1 ) Pub Date : 2021-11-15 , DOI: 10.1016/j.mattod.2021.10.030
Qing Zhang ₁ , Yijun Chen ₁ , Pingdong Wei ₁ , Yi Zhong ₁ , Chaoji Chen ₂ , Jie Cai _{1,

3}

Affiliation

Chitosan-based materials have attracted considerable attention owing to their inherent biodegradability, biocompatibility, and antimicrobial properties. However, the establishment of a scalable technology for the fabrication of high-strength and high-toughness chitosan films remains a major challenge. Herein, a new route for the fabrication of high-strength and high-toughness chitosan films mediated by a unique hydrated chitosan crystal structure is reported, using an aqueous KOH/urea solution as a solvent and an aqueous KCl solution as a neutralization bath. The KCl concentration, neutralization temperature, and neutralization time significantly affect the self-assembly and lateral aggregation of chitosan chains and the microstructure and morphology of the chitosan hydrogels and films. Furthermore, stretching orientation endows the chitosan films with a high tensile strength, Young’s modulus, and work of fracture of 579 ± 52 MPa, 18.8 ± 1.5 GPa, and 26.7 ± 6.9 MJ m, respectively. To the best of our knowledge, the chitosan films developed in this study are the first example of extremely high-strength and high-toughness chitosan films. We believe that our findings will be useful for the fabrication of polysaccharide-based films with excellent mechanical properties and in broader applications in the fields of biomedicine, flexible bioelectronics, water treatment, and food packaging.

中文翻译：

由独特的水合壳聚糖晶体结构介导的极其坚固和坚韧的壳聚糖薄膜

壳聚糖基材料由于其固有的生物降解性、生物相容性和抗菌特性而引起了广泛关注。然而，建立用于制造高强度和高韧性壳聚糖薄膜的可扩展技术仍然是一个重大挑战。在此，报道了一种由独特的水合壳聚糖晶体结构介导的高强度和高韧性壳聚糖薄膜的制备新路线，使用KOH/尿素水溶液作为溶剂和KCl水溶液作为中和浴。 KCl浓度、中和温度和中和时间显着影响壳聚糖链的自组装和横向聚集以及壳聚糖水凝胶和薄膜的微观结构和形貌。此外，拉伸取向赋予壳聚糖薄膜较高的拉伸强度、杨氏模量和断裂功，分别为579±52MPa、18.8±1.5GPa和26.7±6.9MJ·m。据我们所知，本研究开发的壳聚糖薄膜是极高强度和高韧性壳聚糖薄膜的第一个例子。我们相信，我们的研究结果将有助于制造具有优异机械性能的多糖基薄膜，并在生物医学、柔性生物电子学、水处理和食品包装领域得到更广泛的应用。

更新日期：2021-11-15

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