Structure and properties of citric acid cross-linked chitosan/poly(vinyl alcohol) composite films for food packaging applications. (15th July 2023)

• Record Type: Journal Article
• Authors: Jiang, Song; Qiao, Congde; Liu, Runpeng; Liu, Qinze; Xu, Jing; Yao, Jinshui
• Is Part Of: Carbohydrate polymers. Volume 312(2023)
• Publication Date: 2023-07-15
• Subjects: Chitosan -- Poly(vinyl alcohol) -- Crosslinking -- Hydrogen bonds -- Mechanical properties; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2023.120842
• Languages: English
• ISSNs: 0144-8617

Abstract

Abstract: 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. Graphical abstract: Unlabelled Image