Development of thermoplastic starch blown film by incorporating plasticized chitosan. (22nd January 2015)

• Record Type: Journal Article
• Authors: Dang, Khanh Minh; Yoksan, Rangrong
• Is Part Of: Carbohydrate polymers. Volume 115(2015)
• Page Start: 575
• Page End: 581
• Publication Date: 2015-01-22
• Subjects: Thermoplastic starch -- Chitosan -- Extrusion -- Blown film extrusion -- Biodegradable film -- Bio-based material; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2014.09.005
• Languages: English
• ISSNs: 0144-8617

Abstract

Highlights: Homogeneous thermoplastic starch/chitosan (TPS/CTS)-based films were produced by blown film extrusion. Incorporating plasticized chitosan improved extrusion processability and reduced melt flow ability of TPS. TPS film became stronger and more rigid, but less extensible by adding chitosan with 0.37–1.45%. Water absorption and surface stickiness of TPS film decreased by loading chitosan. Possible interaction between starch and chitosan molecules is hydrogen bonds. Abstract: The objective of the present work was to improve blown film extrusion processability and properties of thermoplastic starch (TPS) film by incorporating plasticized chitosan, with a content of 0.37–1.45%. The effects of chitosan on extrusion processability and melt flow ability of TPS, as well as that on appearance, optical properties, thermal properties, viscoelastic properties and tensile properties of the films were investigated. The possible interactions between chitosan and starch molecules were evaluated by FTIR and XRD techniques. Chitosan and starch molecules could interact via hydrogen bonds, as confirmed from the blue shift of OH bands and the reduction of V-type crystal formation. Although the incorporation of chitosan caused decreased extensibility and melt flow ability, as well as increased yellowness and opacity, the films possessed better extrusion processability, increased tensile strength, rigidity, thermal stability and UV absorption, as well as reduced water absorption and surface stickiness. The obtained TPS/chitosan-based films offer real potential application in the food industry, e.g. as edible films.