Cui Luqing, Gao Shanshan, Song Xiaoming, Huang Lianqing, Dong Hehe, Liu Jinling, Chen Fushan, Yu Shitao
Shandong Provincial Key Laboratory of Biochemical Engineering, College of Marine Science and Biological Engineering, Qingdao University of Science & Technology Qingdao Shandong 266042 China
Key Laboratory of Pulp and Paper Science & Technology of Ministry of Education/Shandong Province, Qilu University of Technology Jinan 250353 China.
RSC Adv. 2018 Aug 9;8(50):28433-28439. doi: 10.1039/c8ra05526b. eCollection 2018 Aug 7.
The present study investigates a new solvent system for the dissolution of chitosan and a new method for preparing chitosan membranes. First, aqueous tartaric acid was used to pretreat chitosan. Then, the chitosan was precipitated with ethanol or other regenerating agents, and 1.5 mL of 1-ethyl-3-methylimidazolium acetate ([EMIM]AC) was added to obtain translucent suspensions. The chitosan membranes were prepared by casting the suspensions on glass plates and allowing solvent evaporation. The structure and properties of the films were investigated by SEM, FT-IR, XRD and TGA. Also, the mechanical properties, as well as physical and chemical characteristics, of the chitosan films were evaluated. The results indicated that the optimum dissolution time was 10 min and the most suitable drying temperature was 60 °C. The thus-prepared film was moderately thick (about 0.02 mm) and had a smooth surface, without curling. The chitosan film prepared by ethanol regeneration had a tensile strength of up to 24 MPa, a minimum swelling degree of 78%, and a water vapor transmission rate of 270 g m d without the addition of plasticizer.
本研究考察了一种用于溶解壳聚糖的新型溶剂体系以及一种制备壳聚糖膜的新方法。首先，用酒石酸水溶液对壳聚糖进行预处理。然后，用乙醇或其他再生剂使壳聚糖沉淀，并加入1.5 mL乙酸1-乙基-3-甲基咪唑鎓（[EMIM]AC）以获得半透明悬浮液。通过将悬浮液浇铸在玻璃板上并使溶剂蒸发来制备壳聚糖膜。通过扫描电子显微镜（SEM）、傅里叶变换红外光谱（FT-IR）、X射线衍射（XRD）和热重分析（TGA）对薄膜的结构和性能进行了研究。此外，还对壳聚糖膜的机械性能以及物理和化学特性进行了评估。结果表明，最佳溶解时间为10分钟，最合适的干燥温度为60℃。如此制备的薄膜厚度适中（约0.02 mm），表面光滑，无卷曲。通过乙醇再生制备的壳聚糖膜在不添加增塑剂的情况下，拉伸强度高达24 MPa，最小溶胀度为78%，水蒸气透过率为270 g m⁻² d⁻¹。
