THE EFFECT OF O-PHENYL PHENOL ON THE DYEING OF AN ACRYLIC FIBER WITH BASIC-DYES

The equilibrium uptake of o-phenyl phenol onto Courtelle S at 98-degrees-C was found to follow a Nernst adsorption mechanism, indicating that uptake arises by virtue of hydrophobic interaction as well as ion-dipole, dipole-dipole, and dipole-induced dipole forces operating between the fiber and the nonionic carrier. Differential scanning calorimetry was used to demonstrate the plasticizing action of the carrier on Courtelle S yarn. A linear relationship was obtained between the extent of plasticization, as measured by reduction in T(g) of the fiber, and concentration of carrier applied to the fiber with the maximum extent of plasticization, showing a close correspondence to the aqueous solubility of o-phenyl phenol at 98-degrees-C, the temperature at which the fiber was treated with the carrier. The relationship between the extent of enhancement of uptake of C. I. Basic Green 4 and C. I. Basic Red 13 onto Courtelle S yarn at 98-degrees-C and concentration of the carrier in the dyebath was also examined: The concentration of o-phenyl phenol that gave maximum enhancement of dye uptake coincided with the aqueous solubility of the carrier at 98-degrees-C. (C) 1993 John Wiley & Sons, Inc.