Abstract
The diffusion behavior of an acid dye in Nylon 6 has been investigated as a dynamic dye distribution of two thermodynamically distinct populations of Langmuir type adsorption species and Partition type species. The sum of the dual concentration profiles was calculated by means of a finite difference method according to the Fick's second law. An improved dual diffusion equation gave a profile in good agreement with the experimentally apparent obtained literature profile for Orange II and nylon 6 system under an over-dyeing condition. Thus the validity of the improved theory was confirmed.
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