Abstract:
The structure determination of cellulose represents a significant part in the history of polymer science. On one side, cellulose as a natural and renewable material has valuable physical properties which can be improved with detailed knowledge of the structure. On the other side, it is produced by nature as fibers, e.g. ramie, cotton etc., most suitable for structural studies by X-ray diffraction after their discovery in 1912 and was regarded by scientists as predestined for such an undertaking. The progress utilizing appropriate methods and models will be pursued in this investigation from the beginning of the structural research in 1913 till the proposal of realistic structures of cellulose in the 1970s. Different basic units of the crystal structure are discussed. Many structural models for native cellulose have been suggested over times with parallel or antiparallel running chains in the fibers and supported or abandoned. In this historical review on order in cellulosics, the crystal structure research throughout the times will be critically evaluated and the improvements in experiments and methods discussed. This subject is not restricted to cellulose rather can be extended to further polymer fibers.
摘要:
纤维素的结构测定在聚合物科学史上占有重要地位。在一边,纤维素作为天然和可再生材料具有有价值的物理性质,可以通过详细的结构知识来改善。在另一边,它是由自然生产的纤维,例如苎麻,棉花等。,在1912年发现X射线衍射后最适合进行结构研究,被科学家视为注定要从事这项工作。从1913年结构研究开始到1970年代提出纤维素的现实结构,在这项研究中将继续利用适当的方法和模型取得进展。讨论了晶体结构的不同基本单元。随着时间的推移,已经提出了许多天然纤维素的结构模型,这些模型在纤维中具有平行或反平行的运行链,并被支撑或放弃。在这篇关于纤维素学秩序的历史回顾中,将对整个时期的晶体结构研究进行严格评估,并讨论实验和方法的改进。该主题不限于纤维素,而是可以扩展到其他聚合物纤维。