Abstract
In order to explain the relation between the mode of solubilization by non-ionic surface active agent and the chemical structure of the disperse dyes, visible light absorption spectra of the aqueous dispersions of several aminoanthraquinone dyes were measured for varied contents of the non-ionic surface active agent added as dispersing agent. In further experiment polyoxyethylene glycol, the chemical structure and the properties of which were just the same as those of the hydrophilic group of the non-ionic surface active agent, was used as dispersing agent in place of the latter, and absorption spectrum obtained for each dye was investigated for comparison as well as that of the n-hexan or the benzene solution of the same dye, respectively. The experimental results suggested the following:
(1) While 1, 4, 5, 8-tetraamino-, 1, 4-diamino-and 1-amino-4-hydroxy-anthraquinone were solubilized into the hydrophilic region of the micelle, 1-amino-2-methyl- and 1-methylamino-derivative get in the inner hydrophobic, when the content of the non-ionic dispersing agent is increased above CMC, and the micelle is formed in the solution.
(2) 1, 4-bismethylaminoanthraquinone, however, may be solubilized into the region between the hydrophilic and the hydrophobic of the micelle.
