酸性アゾ染料の染色性に関する研究
第6報 酸性染料色素酸の電気伝導度
1960 年 16 巻 7 号 p. 571-574
詳細
1960 年 16 巻 7 号 p. 571-574
The conductivity of the following three dye acid solutions was measured at 25, 50 and 90°C respectively to search the state of these dyes in aqueous solutions.
Monosulphonic acid: Naphthionic acid→β-Naphthol (I), Disulphonic acid: α-Naphthylamine→Gacid (II), Trlsulphonic acid: Naphthionic acid→G acid (III).
The equivalent conductivity obtained was plotted against the square root of coacentration (N) as in Figs. 1, 2 and 3.
At 25°C, on all of these dyes I, II and III, the presence of ionic micelle of dye is considered from the curve of _??_C-Λ having the maximum. This so-called McBain effect is tend to disappear with the rise of temperature. At 90°C, the relation between _??_C and Λ is represented by strainght line, then I, II and III dyes are considered to be in true solution containing no ionic micelle of these dyes.
In these dyes having the same skeletal structure, the lesser the number of sulphonic acid group, the greater the tendency to form the ionic micelle in aqueous solutions.
