抄録
The kinetics of the dyeing of formalized poly (vinyl alcohol) (PVA) fiber (I) and its acid treated product (II) with three direct dyes have been studied at 70 and 80°C. Each dyeing was made in a finite bath (liquor ratio 1:2000) with 1×10-5 mol/1 of a direct dye and with 0.1 mol/1 of sodium chloride. The apparent diffusion coefficients (D) (Table 3) decreased with an increase in the degree of the formalization. The values decreased in the order, Rhoduline Red B_??_Orange S>Scarlet 4BS, but the equilibrium sorption of dye (C∞) (Table 2) increased in the reverse order. D and C∞ values for II were fairly larger than those for I. It is suggested that the kinetics of the dyeing of I and II with direct dyes are remarkably affected by the cross-linking formed in the formalization reaction of the polymer and by the chemical constitution and size of the dye molecules.
