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Sorption and Swelling of Dyed Wools I—Effect of Sulpho Groups on Water Sorption
Author(s) -
Delmenico J.,
Leeder J. D.,
Trewhella M. A.
Publication year - 1969
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.1478-4408.1969.tb02897.x
Subject(s) - sorption , wool , swelling , chemistry , polymer chemistry , absorption (acoustics) , relative humidity , absorption of water , humidity , nuclear chemistry , organic chemistry , materials science , adsorption , composite material , thermodynamics , physics
Water‐absorption isotherms of wool containing different amounts of one of a homologous series of dyes containing one to three sulpho groups were measured. Isotherms of the dyes alone were also measured. With all the dyes, there was a linear relation at constant relative humidity (r.h.) between water absorption and the amount of dye in the wool, up to the stoichiometric amount. The monosulphonated dye reduced the amount of water sorbed by blocking amino groups and, in addition, by physical exclusion of the water at high r.h. Some of the sulpho groups in the polysulphonated dyes were not blocked by amino groups and increased the amount of water sorbed at low r.h. However, at high r.h., large decreases were obtained because cohesive forces in the wool prevented swelling to accommodate the large potential water‐binding capacity of the free polysulphonated dyes, and the ‘volume exclusion’ effect was predominant. The contribution of the individual sulpho groups and other quantitative aspects to the sorption of water by the wool are discussed.