Diffusion of Disperse Dyes within Nylon 6 from Normal Alcohols

Abstract

In order to obtain some fundamental informations on the solvent dyeing for nylon 6, the diffusion behaviors of C. I. Disperse Orange 3 and Violet 1 within a sheet of nylon 6 from normal alcohols as a medium have been investigated by means of microspectro-photometric method.
The diffusion behaviors of these dyes are very similar each other.
The larger the carbon number of a normal alcohol is, the larger both the activation energy and the frequency factor of diffusion are. That is to say, the diffusion is accelerated by decreasing the carbon number from the view point of activation energy, and by increasing it from the activation entropy.
Water used as a medium for comparison shows the intermediate behavior between ethanol and 1-propanol.
These results correspond well with Tg of the substrates swollen in each medium, and also they can be explained qualitatively in relation to the activation energy and the heat of dyeing.