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The diffusion and the simultaneous reaction with cellulose of six reactive dyes bearing H-acid coupled with a substituted aniline as the chromophore and also bearing different reactive groups, dichlorotriazinyl, monochlorotriazinyl, dichloroquinoxaline-carbonyl and trichloropyrimidinyl, were investigated by the cylindrical film roll method. The experimental profiles of the active and the fixed species for these dyes agreed with the theoretical profiles described by the diffusion equation accompanied by the simultaneous pseudofirst-order reactions of the dye with cellulose and water, whose rate constants were denoted by Kc, and Kw, respectively. Linear relationships between log Kc, and pH were found for C. I. Reactive Red 41. The characteristic relationships similar to those observed by Ingamells et al. were found for Red 1 and Red 2, while they were not found for Red 3, Red 12 and Red 17 which had been applied at higher temperatures. The values of the surface dye concentration for Red 1, Red 2 and Red 41 decreased with increase in pH. The activation energies of the reaction with cellulose and those of the diffusion were found to vary with the reactive groups and, in the case of monochlorotriazinyl dyes, with the substituents on the triazine ring as well.

Diffusion and simultaneous reaction in cellulose of reactive dyes bearing various reactive groups.