ABSORPTION SPECTROSCOPIC STUDIES ON THE I NTERACTIONS BETWEEN ANTHRAQUINONE DYES AND POLYESTER MODEL

In order to obtain information on the dyeing mechanism of polyester fi bers with anthraquinone dyes, interactions between a polyester model a nd anthraquinone dyes have been investigated by the analysis of UV and visible absorption spectra in terms of a modified McRae's equation. M ethyl benzoate was used as the polyester model. Anthraquinone, 1- and 2-substituted anthraquinones with electron donating groups were used a s the anthraquinone dyes. The orientation force of the anthraquinone d yes estimated from the equation was 0 approximately 2kcal/mol, which w as about 0 approximately 15% of the total dye-methyl benzoate interact ion. The sum of the dispersion and induction force of the anthraquinon e dyes estimated from the equation was 4 approximately 14 kcal/mol, wh ich was about 80 approximately 100% of the total dye-methyl benzoate i nteraction. It appears that the dispersion force makes a considerable part of contribution to the dye-methyl benzoate interaction, and orien tation force and induction force makes a much smaller contribution to the interaction.