Rates of Dyeing of Nylon With Orange Ii in the Presence of Sodium Alkylsulfates

The relationship between the rate constants in empirical rate of dyeing equations and the diffusion coefficient of dye in the fibre have been clarified by means of a statistical curve fitting method, where the rate of dyeing curves calculated from the theoretical equations (those of Wilson and Newman) have been compared with those from the empirical equations in the range Mt/M∞ from zero to about 0.8. The comparisons revealed that many of the empirical equations are suitable for describing the dyeing rate when there is a delay of dye sorption in the early stages, and one of them is useful for determining the dyeing rate when there is rapid dye sorption at the initial stages. The fact that these empirical equations fit well to practical dyeing can be explained in terms of the sorption delay caused by the stagnant solution layer surrounding the fibres.

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Effect of Ethyl Xanthogenate on the Absorption of a Cationic Dye on Polyester Fibers: Zeta Potential and Sorption Thermodynamics

Espinosa-Jiménez

Cano-Suárez

1995

Textile Research Journal

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Data are presented for the zeta potential, kinetics, and sorption thermodynamics of CI Brilliant Green on both untreated polyester fibers and polyester pretreated with constant amounts of potassium ethyl xanthogenate at different temperatures. The rising temperature of the system increases dye absorption on untreated polyester, and the rising temperature of absorption increases dye uptake on pretreated polyester. Cationic dye absorption is enhanced by increasing amounts of ethyl xanthogenate taken up by the fibers during pretreatment. The negative zeta potential of pretreated polyester rises when the amount of ethyl xanthogenate in the pretreatment is increased at low concentrations of dye solution. The zeta potential sign changes at high con centrations of cationic dye in the liquid phase. When the amount of ethyl xanthogenate in the pretreatment increases, there is a displacement of this sign inversion toward lesser concentrations. Absorption equilibria, empirical rate constants, activation energy, standard affinity, and enthalpy and entropy of reaction are determined for cationic dye absorption on untreated and pretreated polyester. The results and the molecular structure of the dye and ethyl xanthogenate suggest that the absorption of CI Brilliant Green on the pretreated polyester probably takes place by means of an electrostatic attraction between the dye cation and the negatively charged - S- groups of the ethyl xanthogenate.

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Rates of Dyeing of Nylon With Orange Ii in the Presence of Sodium Alkylsulfates

Cited by 3 publications

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Amphiphilic acid dyes. Dyeing properties and interactions with surface-active systems

Amphiphilic acid dyes. Dyeing properties and interactions with surface-active systems

The mathematical expression of rate constants in empirical rate of dyeing equations in disperse dyeing

Effect of Ethyl Xanthogenate on the Absorption of a Cationic Dye on Polyester Fibers: Zeta Potential and Sorption Thermodynamics

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