Saint Petersburg State University, Universitetsky pr. 26, Peterhof, Saint Petersburg, 198504, Russia; Lappeenranta University of Technology, Department of Physics, Skinnarilankatu 34, Lappeenranta, 53850, Finland.
Institute of Macromolecular Compounds, Russian Academy of Sciences, Bolshoy pr. 31, Saint Petersburg, 199004, Russia; ITMO University, Saint Petersburg, 197101, Russia.
Carbohydr Polym. 2018 Oct 1;197:548-557. doi: 10.1016/j.carbpol.2018.06.037. Epub 2018 Jun 13.
Chitosan (CS) films containing deep eutectic solvent (DES) based on malonic acid (MA) and choline chloride (ChCl) were successfully prepared by solution casting method by using DES content ranging from 0 to 82 wt%. A strong interaction of CS with the components of DES was demonstrated by analyses of water sorption isotherms, atomic force microscopy and FTIR results. The plasticizing effect of the MA and ChCl mixture on the CS matrix was shown by static bulk mechanical measurements, thermal analysis and quantitative nanomechanical mapping (QNM). Elongation at break increased from 3 to 62% at increase of DES content from 0 to 67 wt%, while further increase of DES content led to the decreasing of maximal elongation. Introduction of DES into CS films led to the appearance of glass transition temperature in the region +2 - -2.3 °C. QNM results indicated homogeneity of the films containing up to 75 wt% of DES.
壳聚糖（CS）薄膜中含有基于丙二酸（MA）和氯化胆碱（ChCl）的深共晶溶剂（DES），通过溶液浇铸法成功制备，DES 的含量范围为 0 至 82wt%。通过水吸附等温线、原子力显微镜和傅里叶变换红外光谱结果的分析，证明了 CS 与 DES 成分之间的强烈相互作用。通过静态体积力学测量、热分析和定量纳米力学映射（QNM），显示了 MA 和 ChCl 混合物对 CS 基质的增塑作用。随着 DES 含量从 0 增加到 67wt%，断裂伸长率从 3%增加到 62%，而进一步增加 DES 含量导致最大伸长率下降。DES 的引入导致 CS 薄膜中出现了+2 至-2.3°C 的玻璃化转变温度。QNM 结果表明，DES 含量高达 75wt%的薄膜具有均匀性。
