Wang Luxuan, Huang Shuting, Wang Yixiang
Department of Food Science and Agricultural Chemistry, McGill University, Ste Anne de Bellevue, QC H9X 3V9, Canada.
Membranes (Basel). 2022 Mar 24;12(4):355. doi: 10.3390/membranes12040355.
Increasing utilization of textiles has raised concern regarding the environmental impact brought by the textile manufacturing process and disposal of waste textiles. In our previous work, the dissolution of cotton waste through different solvent systems was demonstrated. Herein, this study aimed to further investigate the recycling of waste cotton-elastane fabrics using HSO, NaOH/urea, and LiCl/DMAc solvent systems. The structure of regenerated films was characterized with Fourier transform infrared spectroscopy and scanning electron microscopy, and the properties of the regenerated films, including transparency, mechanical properties, water vapor permeability, and thermal stability, were investigated. The results revealed that all solvent systems could convert the waste cotton-elastane fabrics into regenerated films with the existence of different forms of elastane components. The elastane fibers were partially hydrolyzed in HSO solvent and reduced the transparency of regenerated films, but they were well retained in NaOH/urea solvent and interrupted the structure of regenerated cellulose films. It is worth noting that the elastane fibers were completely dissolved in LiCl/DMAc solvent and formed a composite structure with cellulose, leading to obviously improved tensile strength (from 51.00 to 121.63 MPa) and water barrier property (from 3.50 × 10 to 1.03 × 10 g m h Pa). Therefore, this work demonstrates the possibility to directly recycle waste cotton-elastane fabrics through dissolution and regeneration, and the resultant films have potential applications as packaging materials.
纺织品使用量的增加引发了人们对纺织品制造过程以及废弃纺织品处理所带来的环境影响的担忧。在我们之前的工作中，展示了通过不同溶剂体系溶解棉废料的方法。在此，本研究旨在进一步探究使用硫酸（HSO）、氢氧化钠/尿素（NaOH/urea）和氯化锂/二甲基乙酰胺（LiCl/DMAc）溶剂体系对废弃棉氨纶织物进行回收利用。利用傅里叶变换红外光谱和扫描电子显微镜对再生膜的结构进行了表征，并研究了再生膜的性能，包括透明度、机械性能、水蒸气透过率和热稳定性。结果表明，所有溶剂体系都能将废弃棉氨纶织物转化为具有不同形式氨纶成分的再生膜。氨纶纤维在硫酸溶剂中部分水解，降低了再生膜的透明度，但它们在氢氧化钠/尿素溶剂中保留良好，并破坏了再生纤维素膜的结构。值得注意的是，氨纶纤维在氯化锂/二甲基乙酰胺溶剂中完全溶解，并与纤维素形成复合结构，从而显著提高了拉伸强度（从51.00兆帕提高到121.63兆帕）和阻水性能（从3.50×10到1.03×10克/平方米·小时·帕）。因此，这项工作证明了通过溶解和再生直接回收废弃棉氨纶织物的可能性，所得薄膜作为包装材料具有潜在应用价值。
