粘胶
纤维素
再生纤维素
硫脲
纤维素纤维
水溶液
材料科学
化学工程
结晶度
纤维
莱赛尔
高分子化学
复合材料
化学
有机化学
工程类
作者
Dong Ruan,Lina Zhang,Jinping Zhou,Huiming Jin,Hui Chen
标识
DOI:10.1002/mabi.200400120
摘要
Abstract Summary: Cellulose was dissolved rapidly in a NaOH/thiourea aqueous solution (9.5:4.5 in wt.‐%) to prepare a transparent cellulose solution, which was employed, for the first time, to spin a new class of regenerated cellulose fibers by wet spinning. The structure and mechanical properties of the resulting cellulose fibers were characterized, and compared with those of commercially available viscose rayon, cuprammonium rayon and Lyocell fibers. The results from wide angle X‐ray diffraction and CP/MAS 13 C NMR indicated that the novel cellulose fibers have a structure typical for a family II cellulose and possessed relatively high degrees of crystallinity. Scanning electron microscopy (SEM) and optical microscopy images revealed that the cross‐section of the fibers is circular, similar to natural silk. The new fibers have higher molecular weights and better mechanical properties than those of viscose rayon. This low‐cost technology is simple, different from the polluting viscose process. The dissolution and regeneration of the cellulose in the NaOH/thiourea aqueous solutions were a physical process and a sol‐gel transition rather than a chemical reaction, leading to the smoothness and luster of the fibers. This work provides a potential application in the field of functional fiber manufacturing. A bundle of fibers with a similar circular cross‐section, indicating the homogeneous and smooth surface of the fibers. magnified image A bundle of fibers with a similar circular cross‐section, indicating the homogeneous and smooth surface of the fibers.
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