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The accessibility of cotton to anionic dyes
Author(s) -
Ladchumananandasivam R.,
Miles L W C,
Hawkyard C J
Publication year - 1994
Publication title -
journal of the society of dyers and colourists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 0037-9859
DOI - 10.1111/j.1478-4408.1994.tb01662.x
Subject(s) - viscose , adsorption , sorption , hydrolysis , chemistry , cellulose , sodium , saturation (graph theory) , chemical engineering , polymer chemistry , organic chemistry , mathematics , combinatorics , engineering
Adsorption isotherms have been obtained for two direct dyes on unmercerised cotton and viscose yarns at the boil in the presence of sodium chloride. Both dyes, CI Direct Red 81 and CI Direct Green 26, show evidence of monomolecular layer adsorption. Controlled acid hydrolysis of cotton was carried out in order to remove non‐crystalline cellulose, and dye sorption values were obtained for the residues. Accessible surface areas have been calculated from the saturation values obtained from the reciprocal plots of the adsorption data. The results are interpreted in terms of a crystalline fibril model of the cotton fibre.