Abstract
Temperature dependence of the rate of diffusion of dyes in PET film was investigated by sublimation method. It was found that the temperature dependence of the rate of the diffusion is described by W. L. F. relation. A master curve (composite curve) can be obtained for different dyes by shifting the log D-temperature curves along the temperature axis. The composite curve thus reduced into that of PNA is expressed by W. L. F. equation. The shift temperature, defined in the composition, increases with the increase in the molecular weight of dye, though rarely the increase in the shift temperature differ between azo- and anthraquinone dyes. It seems that for a given dye the log D-temperature curves obtained for PET film with different fine structures are reduced into a composite curve by shifting of them along the log D axis without any shift along the temperature axis.
