FUNDAMENTAL STUDIES ON DYEING WITH DISPERSE DYES

(XI) THE INTERACTION BETWEEN AMINOANTHRAQUINONE TYPE DISPERSE DYES AND ALCOHOLS BY PAPERCHROMATOGRAPHY

Abstract

It was prevlously reported by us^{2), 3), 4)} thatα-CH…X-Dye type hydrogen bonding made an important contribution to the interaction between disperse dyes and ester type fibres.
In oraer to obtain other suggestions, the interaction between alcohols and disperse dyes is discussed in this paper, using paperchromatography, and noted with the results as follows:
1) In similar manner to esters and amines, there exists the correlation between R_f value and alcohol concentration [A].
Change of free energy (-ΔF) of interaction may be calculated from the estimated K.
2) There is a certain correlation between (-ΔF) and carbon number (C) of alcohol, when the data are plotted on the ordinate and abscisa, respectively,
therefor (-ΔF)=α•C+b ………(1)
where a; apositive constant and b; a constant.
3) The slope a of (1) is related to the molecular weight of dye (D_w) by the equation a=A•D_w+B ………(2)
where A; a positive constant and B; a constant.
4) The results 2) and 3) can not be explained by proton donating or accepting mechanism alone and suggest that an important contribution can be ascribed to van der Waals force as the interaction force between alcohol and dyes.
But, this does not contradict the co-existence of other forces.
5) Hence, it is supposed that van der Waals force makes a good part of contribution to disperse dyeing, too.