Department of Packaging and Materials Technology, Faculty of Agro-Industry, Kasetsart University, Bangkok 10900, Thailand.
Department of Packaging and Materials Technology, Faculty of Agro-Industry, Kasetsart University, Bangkok 10900, Thailand; Center for Advanced Studies for Agriculture and Food, Kasetsart University, Bangkok 10900, Thailand.
Carbohydr Polym. 2015 Jan 22;115:575-81. doi: 10.1016/j.carbpol.2014.09.005. Epub 2014 Sep 16.
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.
本工作旨在通过添加 0.37-1.45%的增塑壳聚糖来改善热塑性淀粉（TPS）薄膜的吹塑加工性能和性能。研究了壳聚糖对 TPS 的挤出加工性能和熔体流动性能的影响，以及对薄膜外观、光学性能、热性能、粘弹性和拉伸性能的影响。通过傅里叶变换红外光谱（FTIR）和 X 射线衍射（XRD）技术评估了壳聚糖和淀粉分子之间可能的相互作用。壳聚糖和淀粉分子可以通过氢键相互作用，这从 OH 带的蓝移和 V 型晶体形成的减少得到证实。尽管壳聚糖的加入降低了可拉伸性和熔体流动能力，增加了黄度和不透明度，但薄膜具有更好的挤出加工性能、增加了拉伸强度、刚性、热稳定性和紫外线吸收能力，以及降低了吸水性和表面粘性。所得到的基于 TPS/壳聚糖的薄膜在食品工业中具有实际的潜在应用，例如作为可食用薄膜。
