School of Materials Science and Engineering, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, PR China.
School of Materials Science and Engineering, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, PR China.
Carbohydr Polym. 2023 Jul 15;312:120842. doi: 10.1016/j.carbpol.2023.120842. Epub 2023 Mar 23.
In this study, the composite films of poly(vinyl alcohol) and citric acid cross-linked chitosan were prepared, and the effect of mass ratio on their structure and properties was investigated in detail. Chitosan was cross-linked by citric acid via an amidation reaction at an elevated temperature, which was confirmed by infrared spectra and X-ray photoelectron spectra. Chitosan is miscible with PVA due to the formation of strong hydrogen bonds between them. Among these composite films, 1:1 CS/PVA film showed excellent mechanical properties, good creep resistance, and shape recovery ability, attributing to its high crosslinking degree. In addition, this film possessed hydrophobicity, excellent self-adhesion property, and the lowest WVP, and it was successfully used as a packaging material for cherry. These observations indicate that the cooperative effects of crosslinking and hydrogen bonds control the structure and properties of chitosan/PVA composite film, which is a very potential material for food packaging and preservation.
在这项研究中，制备了聚乙烯醇和柠檬酸交联壳聚糖的复合膜，并详细研究了质量比对其结构和性能的影响。壳聚糖在高温下通过与柠檬酸的酰胺化反应交联，这一点通过红外光谱和 X 射线光电子能谱得到了证实。壳聚糖与 PVA 由于它们之间形成了强氢键而具有良好的混溶性。在这些复合膜中，1:1 CS/PVA 膜表现出优异的机械性能、良好的抗蠕变性和形状恢复能力，这归因于其高交联度。此外，该膜具有疏水性、优异的自粘性和最低的水蒸气透过率，成功地用作樱桃的包装材料。这些观察结果表明，交联和氢键的协同作用控制了壳聚糖/PVA 复合膜的结构和性能，这是一种非常有潜力的食品包装和保鲜材料。
