College of Textile and Clothing Engineering, Soochow University, Suzhou 215123, China; National scientific research base for waterless coloration and finishing with supercritical fluid (China Textile Engineering Society), Soochow University, Suzhou 215123, China; Jiangsu Engineering Research Center of Textile Dyeing and Printing for Energy Conservation, Discharge Reduction and Cleaner Production(ERC), Soochow University, Suzhou 215123, China.
College of Textile and Clothing Engineering, Soochow University, Suzhou 215123, China; National scientific research base for waterless coloration and finishing with supercritical fluid (China Textile Engineering Society), Soochow University, Suzhou 215123, China; Jiangsu Engineering Research Center of Textile Dyeing and Printing for Energy Conservation, Discharge Reduction and Cleaner Production(ERC), Soochow University, Suzhou 215123, China.
Int J Biol Macromol. 2024 Nov;281(Pt 2):136040. doi: 10.1016/j.ijbiomac.2024.136040. Epub 2024 Oct 17.
A novel and eco-friendly approach to modify natural cotton fiber by flash-explosion with a sub- or supercritical fluid of carbon dioxide (sub- or SCF-CO) for improving its structure and properties was constructed for the first time. The achieved results demonstrate that remarkable improvements in the coloration performance of cotton fiber by 71.1 % and the water retention by 1001.2 % against the control could be readily available by employing the flashily-explosion method at a recommended condition with 4-cycle explosion in sub- or SCF-CO, and system temperature, fluid treatment duration and explosion number exhibited much more pronounced positive influences among all parameters. Additionally, minimal influences from the supercritical explosion on cotton fiber micronaire value, thermal property and tensile breaking strength were also observed. The scanning electron microscopy (SEM) and porosity investigations clearly show that plenty of micropores and/or strip fissures were formed on the fiber surfaces and their inner phases, and notably improved fiber surface area, pore volume and size were also obtained after a subsupercritical flash-explosion. Nuclear magnetic resonance hydrogen spectroscopy (H NMR) and Fourier transform infrared spectroscopy (FT-IR) analysis disclose that numbers of hydrogen bonds between the fiber macrochains and/or from their intramolecular chains were broken by generating numerous free hydroxyl groups, which reasonably supported the improvements of the dye uptake behaviors and water retention properties, etc. The Energy-dispersive X-ray spectroscopy (EDS) analysis on the fiber cross-sections further confirms that a loosening of the inner aggregation structure of the cotton fiber was achieved after a flash explosion by significantly enhancing its coloration performance, etc. This innovative approach provides a promising idea and possibility as an alternative to chemical methods via mechanically and physically modifying fiber or other materials with sub- or SCF-CO fluid in an eco-friendly and sustainable manner.
首次构建了一种新颖且环保的方法，通过亚临界或超临界二氧化碳（亚临界或 SCF-CO）的闪蒸爆炸来修饰天然棉纤维，以改善其结构和性能。所得结果表明，通过在推荐条件下采用闪蒸爆炸法，在亚临界或 SCF-CO 中进行 4 次爆炸，棉纤维的上染性能可提高 71.1%，保水率可提高 1001.2%，而对照样则可获得显著改善，系统温度、流体处理时间和爆炸次数等参数对所有参数都有更显著的积极影响。此外，超临界爆炸对棉纤维马克隆值、热性能和拉伸断裂强度的影响也很小。扫描电子显微镜（SEM）和孔隙率研究清楚地表明，纤维表面及其内部相中形成了大量的微孔和/或条状裂缝，并且在亚超临界闪蒸爆炸后，纤维的比表面积、孔体积和尺寸也得到了显著提高。核磁共振氢谱（H NMR）和傅里叶变换红外光谱（FT-IR）分析表明，纤维大分子链之间或分子链内部的氢键数量因生成大量游离羟基而被打破，这合理地支持了上染行为和保水性能等方面的改善。纤维横截面的能谱（EDS）分析进一步证实，通过显著提高纤维的上染性能等，在闪蒸爆炸后，棉纤维的内部聚集结构变得疏松。这种创新方法为通过机械和物理方式用亚临界或 SCF-CO 流体修饰纤维或其他材料提供了一种有前途的想法和可能性，是一种环保且可持续的替代化学方法的途径。
