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Oxidation and aging of cellulose
Author(s) -
Lewin Menachem
Publication year - 1997
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19971180192
Subject(s) - cellulose , chlorine , polymerization , polymer , degradation (telecommunications) , chemistry , chromophore , polymer chemistry , bromine , redox , degree of polymerization , accelerated aging , photochemistry , organic chemistry , telecommunications , computer science
Oxidation of cellulose by chlorine, bromine, hydrogen peroxide and ozone and the functional groups formed are reviewed. The roles of the pH and of the nature of the oxidant in the formation of carboxy‐ and keto‐celluloses are discussed. The relationships between the functional groups, degradation and stability of the celluloses enable to predict the aging and storage behavior of the polymer. The “active” carbonyls are responsible for the peeling reaction and the formation of the yellow chromophore in alkaline solutions as well as for the reversion in color on aging. The nature of the yellow chromophore, its spectra at several pH values, its use for the characterization of cellulose, e.g. the rapid determination of the degree of polymerization and for the estimation of the primary and secondary degradation of the polymer and its stability on storage and aging are discussed. The parallelism between the yellowing and the reversion in color is reviewed.