Diffusion of disperse dye in atactic polystyrene

摘要

AbstractSublimative desorption experiments were carried out on atactic polystyrene containingp‐nitroaniline,p‐aminoazobenzene, or C.I. Disperse Yellow 7 at 114°–170°C (above theTgof the polymer). The diffusion coefficient of each dye in the polymer increased monotonically with rise in the desorption temperature. The mode of this change was exactly expressed by a WLF relation having the universal parameters given for amorphous polymers. The value ofBd, defined as the ratio of diffusional penetrant volume to that of a segment of the chain molecule, varied from 0.37 to 0.70 for the different dyes used. It is also shown that theBdvalue is related to the logarithmic rotational volume of the dye molecule estimated from a molecula