抄録
The diffusion coefficients of purified dye acids of three acid dyes (C. 1. 176, C. 1. 182 and C. 1. 184) in Amilan were determined by the two methods, i. e. the use of Hill's equation and the microscopic measurement of the distance of dye penetration, and the limit of application of these methods are discussed.
The diffusion coefficients of these dyes in the unstretched fibre are all about ten times as large as those of the stretched fibre, and it appears that the differences in the fine structure of fibre greatly affects diffusion coefficient.
With increasing sulphanation, the diffusion coefficient of acid dye in Amilan decreases, while the activation energy of diffusion increases.
The authors have derived the simple equation which is able to give the time of half dyeing for Amilan in terms of the diffusion coefficient and the denier of filament. The equation is:
