采用干喷湿法制备再生纤维素纤维,研究了凝固浴温度和牵伸倍数对纤维性能和结构的影响,探究了纤维晶态结构的变化。结果表明:对于氯化锂/二甲基乙酰胺溶剂体系,最大牵伸倍数和再生纤维的力学性能受凝固浴温度影响较大,凝固浴温度显著影响纤维的力学性能和微观结构。在凝固浴温度为0℃时,纤维的拉伸强度最高可达198MPa,而在-20℃时拉伸模量达到最高值17.3GPa。随着牵伸倍数的增加,纤维强度和模量显著提高,纤维截面更为规则,孔洞和裂纹数量减少。低温条件有利于纤维形成致密的微观结构和较高的结晶度。凝固浴温度和牵伸倍数可显著调控再生纤维素纤维的性能和微观结构。
This study prepared regenerated cellulose fibers by dry-jet wet spinning to investigate the influence of different coagulation bath temperatures and draw ratios on the properties and structure of the fibers.The changes in crystalline structure of the regenerated fibers were systematically studied.The results indicated that the coagulation bath temperature significantly affected the maximum draw ratio and the mechanical properties of the regenerated fibers for the lithium chloride/dimethylacetamide solvent system.The temperature of the coagulation bath had a notable influence on the mechanical properties and microstructure of the fibers.At 0℃,the maximum tensile strength of the fibers reached up to 198MPa,while a maximum tensile modulus of 17.3GPa was achieved at -20℃.With the increase of the draw ratio,the fiber strength and modulus were significantly enhanced,resulting in more regular fiber cross-sections with reduced pore and crack densities.XRD and SEM analyses revealed that lower temperatures favored the formation of dense microstructures and higher crystallinity in fibers.By adjusting coagulation bath temperature and draw ratio,the performance and microstructure of the regenerated cellulose fibers could be significantly improved.
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基金资助
国家自然科学基金联合基金项目(U21A2096);山西省自然科学基金青年项目(202103021223459)
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