| Abstract: | Cyanuric chloride was utilized as a crosslinking agent in forming a chemical linkage between some direct dyes and the available sites in the macromolecular structure of nylon-6. This chemical treatment was carried out on nylon-6 fabrics before and after being γ-irradiated in air with different radiation doses. The so-called dye fixation of three direct dyes, which contain at least one amino group in their chemical structure, was assessed in terms of extraction in 50% aqueous solution of N, N-dimethylformide. It was found that the dye fixation of the direct dyes under investigation depends essentially on the cyanuric chloride concentration. However, low concentrations of 1% were found to be sufficient to produce good dye fixation. Moreover, nylon-6 fabrics when irradiated prior to dyeing and treatment acquire additional dye fixation. The pH of the dyeing bath and the added solvents were found to play a specific role in the dye fixation process. © 1997 John Wiley & Sons, Ltd. |
