Abstract
Dyeing of grafted polyamide-6 fibres with anionic and cationic dyes was performed in order to investigate the possibility of changing the fibre dyeability. It was observed that grafting of polyamide fibres decreased its anionic dyeability and increased the cationic dyeability. Increasing the graft yield on the polyamide fibres resulted in a decrease in the relative specific dyeing rate constant and a decrease in the apparent activation energy of diffusion of anionic dyes. The contrary was true for cationic dyeing. Calculations of the affinity and heat of dyeing revealed negative values for both anionic and cationic moieties on the grafted polyamide fibres. It was also found that dyes having a low ratio of organicity to inorganicity, irrespective of their being cationic or anionic, tend to form ionic bonds with the functional groups in the modified substrate.
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