天然棕色棉纤维在[BMIM]Cl离子液体中的溶解和再生性能研究

Study on Dissolution and Regeneration Properties of Natural Brown Cotton Fiber in[BMIM]Cl Ionic Liquid

利用1-丁基-3-甲基咪唑氯化物([BMIM]Cl)离子液体溶解天然棕色棉纤维,制备棕棉再生纤维素;利用偏光显微镜观察溶解过程,采用黏度法、红外光谱、X射线衍射、热重、扫描电镜等对棕棉再生前后纤维素的结构进行表征。结果表明:离子液体可以溶解棕棉纤维素,先产生球形膨胀,然后溶解;溶解过程中,可以明显看到纤维中腔的色素沉积物;溶解后的再生纤维素聚合度下降,纤维的结晶结构被破坏,同时再生纤维素的热稳定性下降;再生纤维素截面结构均匀致密,内部不存在空隙结构,说明色素物质能够与纤维素很好地混合。

brown cotton regenerated cellulose was prepared by dissolution of natural brown cotton fibers in 1-butyl-3-methylimidazole chloride[BMIM]Cl ionic liquid.Dissolution process was observed with the polarizing microscope.The structure of regenerated brown cotton cellulose was characterized by infrared spectroscopy,X-ray diffraction,thermal analysis,scanning electron microscopy.The results show that natural brown cotton fibers can be dissolved in[BMIM]Cl ionic liquid;spherical expansion first appeared and then the cellulose was dissolved.In the dissolution process,the pigment sediment could be observed obviously inside the lumen of the fiber.Polymerization degree of dissolved regenerated cellulose declines;crystalline structure of fiber is destroyed;meanwhile,heat stability of regenerated cellulose drops;cross-sectional structure of regenerated cellulose is even and compact;there is no gap structure in the regenerated cellulose;this indicates pigment substance can well mix with cellulose.