Kuznik Irina, Kruppke Iris, Cherif Chokri
Institute of Textile Machinery and High Performance Material Technology (ITM), Technische Universität Dresden, 01069 Dresden, Germany.
Polymers (Basel). 2022 Jan 25;14(3):477. doi: 10.3390/polym14030477.
Ionic liquids offer alternative methods for the sustainable processing of natural biopolymers like chitosan. The ionic liquid 1-butyl-3-methylimidazolium acetate (BmimOAc) was successfully used for manufacturing of pure chitosan-based monofilaments by a wet spinning process at lab-scale. Commercial chitosan with 90% deacetylation degree was used for the preparation of spinning dopes with solids content of 4-8 wt.%. Rheology tests were carried out for the characterization of the viscometric properties. BmimOAc was used as a solvent and deionized water as coagulation and washing medium. Optical (scanning electron microscope (SEM), light microscope) and textile physical tests were used for the evaluation of the morphological and mechanical characteristics. The manufactured chitosan monofilaments a homogeneous structure with a diameter of ~150 μm and ~30 tex yarn count. The mechanical tests show tensile strengths of 8 cN/tex at Young's modulus up to 4.5 GPa. This work represents a principal study for the manufacturing of pure chitosan fibers from ionic liquids and provides basic knowledge for the development of a wet spinning process.
离子液体为壳聚糖等天然生物聚合物的可持续加工提供了替代方法。离子液体1-丁基-3-甲基咪唑醋酸盐（BmimOAc）已成功用于在实验室规模通过湿法纺丝工艺制造纯壳聚糖单丝。使用脱乙酰度为90%的商业壳聚糖制备固含量为4-8 wt.%的纺丝原液。进行流变学测试以表征粘度特性。使用BmimOAc作为溶剂，去离子水作为凝固和洗涤介质。通过光学（扫描电子显微镜（SEM）、光学显微镜）和纺织物理测试来评估形态和机械特性。所制造的壳聚糖单丝具有均匀的结构，直径约为150μm，纱线支数约为30 tex。力学测试表明，在杨氏模量高达4.5 GPa时，拉伸强度为8 cN/tex。这项工作是关于从离子液体制造纯壳聚糖纤维的一项主要研究，并为湿法纺丝工艺的开发提供了基础知识。
