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Concentration Dependence of the Diffusion Coefficients of Disperse Dyes in Polyethylene Terephthalate
Author(s) -
Kojima H.,
Ujima T.
Publication year - 1975
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.1478-4408.1975.tb03235.x
Subject(s) - polyethylene terephthalate , diffusion , dyeing , disperse dye , amorphous solid , penetrant (biochemical) , volume (thermodynamics) , chemistry , polymer , polyethylene , volume fraction , materials science , thermodynamics , analytical chemistry (journal) , polymer chemistry , organic chemistry , composite material , physics
Diffusion coefficients of disperse dyes have been calculated by Matano's method from diffusion profiles in polyethylene terephthalate(PET). The diffusion coefficients (D c ) clearly indicate concentration‐dependence. It has been found, from the densities of the dyed PET and the dye, that there is no overall change in the volume of the PET and dye in dyeing. The instrinsic diffusion coefficients have been calculated from D c and the volume fraction (φ 1 ) of penetrant in the amorphous region. From these values, thermodynamic diffusion coefficients (χẗ) were obtained. It has been found that the relation between 1/log (χẗ/χ o ) and 1/φ 1 is a straight line, and it therefore seems reasonable to assume that the diffusion of disperse dyes in PET can be described by Fujita's ‘free volume theory’ for the diffusion of low molecular‐weight organic compounds in an amorphous high‐polymer.