Abstract
The diffusion of 1:2 metal complex dyes into biaxally drawn nylon 6 film from an infinite dyebath has been studied by the film roll method. The concentration profiles of the dyes in nylon were found to be Fickian, i.e. the diffusio_??_ coefficient calculated was concentration independent. Furthermore, changes in dyebath concentration in a between 1.5×10-5mol/l and 3.5×10-4mol/l had no effect on both the shape of Fickian profile and the pentration distance at a given time. It is concluded that the dyes in the polymer do not interact solely with the terminal amin endogroups in the nylon.
Using the surface concentration (equal to equilibrium adsorption) calculated from the profiles, the adsorption isotherms wa found to be curvature like Freundlich type. A possible explanation on the isotherm and the interaction between polymamide and the dye was made. The activation energy of diffusion in a temperature range from 75°C to 90°C was about 25kcal/mol.
