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Spectroscopic study of interactions between model direct dyes and cotton
Author(s) -
Pielesz Anna
Publication year - 2007
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.25566
Subject(s) - cellulose , aqueous solution , tautomer , adsorption , stacking , hydrazone , chemical structure , biphenyl , polymer chemistry , hydrogen bond , chemistry , nuclear magnetic resonance spectroscopy , spectroscopy , ultraviolet visible spectroscopy , materials science , photochemistry , chemical engineering , molecule , organic chemistry , quantum mechanics , engineering , physics
Although examined for years, interactions between direct dyes and the chemical structure of cotton cellulose remain an interesting, and still not entirely known, chemical phenomenon occurring in the fiber. Ten model azo dyes have been studied in aqueous solution, as dye powders and on cotton fabric using 13 C MAS NMR and UV–visible spectroscopy. NMR spectroscopy indicates that model azo dyes, especially dye 8, interact by π‐stacking at the central biphenyl group, and that there is hydrogen bonding with cellulose. Model azo dyes are present as the azo or hydrazone tautomer. The UV–visible λ max indicate that shifts are attributed to adsorption of model azo dyes into cellulose surfaces. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 758–766, 2007