Chemical physics of cellulose nitration

The physical mechanisms responsible for the kinetics of nitration of cellulose raw materials of different origin have been studied. It has been shown that the main nitration rate-limiting factor is the speed of untwisting of supercoiled cellulose fibers. This process limits the penetration of nitrat...

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Published inRussian journal of physical chemistry. B Vol. 10; no. 2; pp. 245 - 259
Main Authors Stovbun, S. V., Nikol’skii, S. N., Mel’nikov, V. P., Mikhaleva, M. G., Litvin, Ya. A., Shchegolikhin, A. N., Zlenko, D. V., Tverdislov, V. A., Gerasimov, D. S., Rogozin, A. D.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.03.2016
Subjects
Chemistry
Chemistry and Materials Science
Kinetics and Mechanism of Chemical Reactions. Catalysis
Physical Chemistry
structure formation
hierarchical systems
cellulose
physical model
nitration
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Summary:The physical mechanisms responsible for the kinetics of nitration of cellulose raw materials of different origin have been studied. It has been shown that the main nitration rate-limiting factor is the speed of untwisting of supercoiled cellulose fibers. This process limits the penetration of nitrating agents into microcrystalline regions and, thus, the total reaction rate. The constructed physical model provides an adequate explanation of all the experimentally observed features of the cellulose nitration process, particularly as a function of cellulose origin (cotton, flax, wood) and preparation/treatment methods (sulfite, sulfate, bleached, refined with sulfurous or boric acids or acetone). The theoretical results have been tested in practice.
ISSN:1990-7931
1990-7923
DOI:10.1134/S199079311602024X