Abstract
The effect of poly (ethylene glycol) (PEG) on the dyeing properties of vinylon fiber with a milling acid dye, Kayanol Milling Red RS 125 (C. I. Acid Red 114), has been investigated in dye-PEG-sodium chloride aqueous solutions at 80 and 90°C. Each dyeing was made in a finite bath (liquor ratio 1:1, 500) with1×10-4 mol/L of the dye in the presence of 0.1mol/L of sodium chloride. The reduced viscosities of dye-PEG (0.1g/dL) aqueous solutions increased with increasing dye concentrations and showed a maximum value. The absorption maximum (λmax) of the dye shifted to shorter wavelength and the equilibrium sorption of dye (C∞) gradually decreased with an increase in the concentration and weight-average molecular weight (_??_W) of PEG. The results are attributed to dye-PEG complex formation. The Apparent diffusion coefficient (D) and apparent rate constant (K) of dyeing varied in an opposit tendency from C∞
