Abstract
Diffusion of disperse dyes in the four poly(ethylene terephthalate) (PET) fibers having different dyeabilities was investigated in relation to the segmental motion of the polymer.(1) In the case of dyeing with C. I. Disperse Red 1 at various temperatures for 10 minutes, the figures which show S shape relations between dyeing temperatures and dye uptakes were obtained for each fiber. There was also observed a linear relation between the peak tempera- tures of mechanical loss tangent(main dispersion) and the inflection points of the above mentioned dye uptake-dyeing temperature relations. (2) The temperature dependence of the diffusion coefficients of C. I. Disperse Yellow 7, Orange 5 and Red 7 for the fibers obeyed the Williams-Landel-Ferry equation, with the above mentioned inflection points as standard temperature, Ts. Here, T and aT are the temperature and the shift factor, respectively. (3) The temperature dependence of the diffusion coefficients of another azo dyes in the literature in PET films was also found to obey the above equation.
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