Abstract
The kinetic behavior of CI Disperse Blue 79 on poly(ethylene-2,6-naphthalenedicarboxylate) fiber was investigated. The dye uptake, time of half dyeing, diffusion coefficient, activation energy and dyeing rate were determined. The dyeability, light fastness, fading characteristics and the fading rate constant at the different dyeing temperatures and dye bath concentrations were also evaluated. The obtained results indicated that the free volume in a polymer–dye (diluent) system is the main factor determining the kinetic data under investigation. The rate of dyeing is closely related to the diffusion behavior of dyes on PEN fiber. The dyeing rate increases with increasing diffusion coefficient of the dye. In addition, the fading process follows first-order kinetics.
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