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The Physico‐chemical Hydrodynamics of Dyeing
Author(s) -
McGregor R.,
Peters R. H.,
Varol K.
Publication year - 1970
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.1478-4408.1970.tb02922.x
Subject(s) - dyeing , diffusion , kinetics , adsorption , partition coefficient , aqueous solution , boundary layer , thermodynamics , chemistry , materials science , polymer , chemical engineering , chemical physics , chromatography , organic chemistry , physics , classical mechanics , engineering
The rates of uptake of two disperse dyes by films of methoxymethylnylon 6.6 have been measured as a function of rate of flow of liquid using the apparatus described in part I (p. 437). The kinetics were found to be in general controlled by diffusion through the liquid and into the film itself. It has been shown that the kinetics may be described in terms of a model in which dye is assumed to diffuse across a boundary layer, followed by adsorption at the film surface, from which diffusion into the polymer film proceeds. The shape of the rate‐of‐dyeing curve has been shown to depend on a parameter that is dependent on the diffusion coefficients of dye in the aqueous and in the film phases, the partition coefficient of the dye and the thickness of the boundary layer.