Abstract

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This article aims to study the effect of chemical modification of cotton fabrics on their dye-ability towards disperse and direct dyes. The cotton samples were modified with 2-cholor-2-dimethylaminoethyl hydrochloride with two different concentrations (10 and 30) %. The obtained synthesized dimethylamino ethyl (DMAE) cotton samples, had two different nitrogen contents (0.386, 0.795) N%. The dye-ability expressed as (K/S) values were measured for the (DMAE) cotton that dyed separately with disperse and direct dyes dye classes at different dyeing temperatures and different dyeing times. The obtained results verify the role of modification process in the production of modified cotton with excellent dye-ability towards disperse and direct dyes under neutral pH conditions in the absence of salt with high reactivity, giving high fixation efficiency and good dyeing quality. The work is extended to study dyeing diffusion kinetics on those sensitized and dyed cotton fabrics with direct dye and thermodynamic parameters including: % exhaustion, dyeing rate constant, half dyeing time, and diffusion coefficient and activation energy. The results of this part deduced that modification process improved the structural characteristics of the cotton fabrics via improving their behviour for all of diffusion kinetic parameters.

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