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Kinetics of Simultaneous Decrystallization and Crystallization Induced in High-modulus Rayon by Bromine Water by Menachem Lewin; Hilda Guttmann; Arie Knoll; David Derfler is a Materials Science article available to read on EtoBox.

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## Abstract Studies of the effect of aqueous Br~2~ solution on the fine structure of cellulose have shown that the accessibility of the cellulose is a complex function of the duration of treatment. Following immersion of rayon‐cellulose in the Br~2~ solution, its accessibility is observed to increase until a peak is reached, after which the accessibility decreases with time. For higher temperatures and greater concentrations of Br~2~, a sharper peak and faster rates of increase and decrease of accessibility are obtained. In order to explain this behavior, a mathematical model of the kinetics is postulated involving two opposing first‐order processes occurring simultaneously. One process describes the decrystallization of crystalline regions within the cellulose by opening intermediate linkages due to Van‐der‐Waals forces involved. The second process relates to the crystallization of the less‐ordered regions. The rate constants for these processes are determined by fitting experimental curves to the postulated analytical expression with the aid of a digital computer program. Experiments carried out on high‐modulus rayon showed that for this type of cellulose, the effect described ab

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Author

Menachem Lewin; Hilda Guttmann; Arie Knoll; David Derfler

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); Wiley (ISSN 0360-6376)

Published

1982

Language

EN

Field

Materials Science (Physical Sciences)