ABSTRACT:The effect of temperature on the dyeing rate constant k, diffusion coefficient D, time of half-dyeing t 1/2 was evaluated for the dyeing of polyester fibers with two disperse dyes, an azo and an anthraquinone dye. Activation energies of diffusion E were calculated. The polyester dyeing equilibrium was also studied and the partition coefficient K and standard affinity ⌬°at various temperatures were determined for the anthraquinone dye. Standard enthalpy ⌬H°and standard entropy ⌬S°of dyeing were also obtained. The same equilibrium parameters were not obtained for the azo dye because of its dyeing behavior. A similar kinetic and equilibrium study was made for the pure azo and anthraquinone compounds free from the dispersing agents present in the commercial dyes and the results are discussed.
ABSTRACT:The effect of temperature on the dyeing rate constant k, diffusion coefficient D, and time of half-dyeing t 1/2 was evaluated for the dyeing of polyester fibers with two disperse dyes, an azo and an anthraquinone dye. Activation energies of diffusion E were calculated. The polyester dyeing equilibrium was also studied and the partition coefficient K and standard affinity ⌬°at various temperatures were determined for the anthraquinone dye. Standard enthalpy ⌬H°and standard entropy ⌬S°of dyeing were also obtained. The same equilibrium parameters were not obtained for the azo dye because of its dyeing behavior. A similar kinetic and equilibrium study was made for the pure azo and anthraquinone compounds free from the dispersing agents present in the commercial dyes and the results are discussed.
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