By Peter Zugenmaier

ISBN-10: 3540739343

ISBN-13: 9783540739340

Cellulose as an plentiful renewable fabric has prompted simple and utilized examine that has ended in major development in polymer technology. This ebook discusses trustworthy crystal constructions of all cellulose polymorphs and cellulose derivatives. versions are represented in graphs, including a suite of geometrical information and the atomic coordinates. This ebook is a concise consultant for participants of the fabrics and lifestyles sciences groups drawn to cellulose and similar materials.

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This is an important statement, since later space group P21 was wrongly assigned as the space group for the large eight-chain unit cell of Valonia and space group P21 was also wrongly assigned to a two-chain subcell of the large eight-chain triclinic P1 space group. The findings concerning the (003) reflection were extended to other cellulose species such as ramie and cotton (Hebert and Muller 1974) for which the generally accepted twochain unit cell was proposed but space group P21 was rejected.

Amazingly, Kiessig as well as Sponsler and Dore considered two different crystal forms or statistical arrangements of chains as a possibility to overcome the discrepancies concerning the presence of extinct reflections by the proposed space group, which had little impact on the discussion of the cellulose crystal structure over the years. 5 Historical Development of X-ray Models for Native Cellulose 37 Fig. 18 The crystallite orientation of stretched tunicin cellulose and corresponding X-ray patterns.

Meyer and Mark later abandoned the micellar model and turned to the macromolecular concept. They supported the fiber model of FreyWyssling (1936), which originated from the fringed micellar concept of Herrmann et al. (1930) as well as Staudinger’s result that the cellulose chains have to be longer than the micelles. Therefore, chains might pass through several micelles. The idea of Staudinger proved to be correct that the entities or basic structural units in solution are dissolved macromolecules and not micelles.

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Crystalline cellulose and cellulose derivatives: characterization and structures by Peter Zugenmaier

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