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- W581983295 abstract "An overview of studies of the structure of cellulose is presented and begins with a historical perspective, developed with particular emphasis on the early diffractometric studies. More recent studies are then described, and the key questions confronted in any analysis of diffractometric data are discussed. The central questions are concerned with the validity of the assumption that the unit cells of cellulose belong to space group P21, and whether the twofold screw axis associated with this space group coincides with the molecular chain axes. The diversity of the interpretations which occur in the literature and in following chapters is noted. More recent spectroscopic investigations are then discussed, with emphasis on the degree to which they may provide additional information concerning structure. It is noted that although both Raman spectroscopy and CP-MAS 13C NMR cannot provide direct information concerning the positions of molecules in the unit cells, they are sensitive to the values of the internal coordinates. Thus, they provide information complementary to the diffractometric data in that it serves to constrain the acceptable structural models to a smaller subset than that otherwise admissible on the basis of diffractometric observations alone. In this respect, the spectroscopic information complements the diffractometric data in the same way as the assumptions concerning the symmetry of the unit cell. Furthermore, it appears that the structures suggested by the spectroscopic studies represent relatively small although significant departures from those derived on the basis of diffractometry alone. In anticipation of future directions in studies of celluloses, it is noted that multidisciplinary approaches, similar to some described in later chapters, hold great promise for future progress in understanding the structural diversity that is characteristic of cellulose." @default.
- W581983295 created "2016-06-24" @default.
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- W581983295 date "1987-06-22" @default.
- W581983295 modified "2023-09-30" @default.
- W581983295 title "The Structures of Cellulose" @default.
- W581983295 doi "https://doi.org/10.1021/bk-1987-0340" @default.
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