Nicolaus Copernicus University in Toruń, Faculty of Chemistry, Chair of Physical Chemistry and Physicochemistry of Polymers, 7 Gagarina Street, 87-100 Toruń, Poland.
Carbohydr Polym. 2021 Mar 1;255:117527. doi: 10.1016/j.carbpol.2020.117527. Epub 2020 Dec 17.
In this work deep eutectic solvent (DES), based on the mixture of choline chloride and lactic acid, were suggested as chitosan films plasticizers. The molecular structure and properties of films obtained using chitosan, with different degree of deacetylation and 0-80 wt.% DES content (ω), were studied by means of FTIR spectroscopy, SEM and AFM microscopy (films' surface properties) together with optical characteristics, water vapor transmission rate (WVTR), water vapor permeability (WVP), tensile strength (TS) and elongation at break (E). Scanning electron micrographs revealed that all chitosan-DES films were smooth and uniform. DES significantly improves the film flexibility (E increases of ca. 160 % after incorporation of 80 wt.% DES), slightly decreases tensile strength and also improves antioxidative properties while simultaneously, increasing water vapor permeability (WVP). Films prepared in this study exhibit characteristics that qualify them for potential use as an active packaging material.
在这项工作中，基于胆碱氯化物和乳酸的混合物的深共晶溶剂 (DES) 被建议用作壳聚糖膜的增塑剂。使用不同脱乙酰度的壳聚糖和 0-80wt.% DES 含量 (ω) 制备的薄膜的分子结构和性能通过傅里叶变换红外光谱、SEM 和 AFM 显微镜（薄膜的表面性质）以及光学特性、水蒸气透过率（WVTR）、水蒸气渗透率（WVP）、拉伸强度（TS）和断裂伸长率（E）进行了研究。扫描电子显微镜照片显示，所有壳聚糖-DES 薄膜均光滑且均匀。DES 显著提高了薄膜的柔韧性（掺入 80wt.%DES 后，E 增加约 160%），略微降低了拉伸强度，同时提高了抗氧化性能，同时增加了水蒸气渗透率（WVP）。本研究制备的薄膜具有特性，使其有潜力用作活性包装材料。
