Carrier Action on the Dyeing of Polyester Fiber in Relatio to their Thermal History

Abstract

The dyeing of poly(ethylene terephthalate) fibers heat-set at a constant length with Dispersol Fast Scarlet B in the presence of p-phenylphenol as a carrier wainvestigated. Accelerating effects of the carrier on diffusion rate of the dye was separated into two parts; effect A is caused by the presence of ihe carrier in the fibers and effect B is derived from the change of fine structure of the fibers due to carrier absorption.
The results are as follows. (1) Log(P₁/P₂), as a measure of effect A, decreased with the increase in heat-settingtemperature and its reciprocal was shown to be linearly related to the reciprocal concentration of the carrierwhere P₁, is the dye penetration coefficient on the normal carrier dyeing and Pthe dye penetration coefficient on the dyeing in the absence of the carrier usinthe fibers with carrier pretreatments and the following extraction. (2) Log(P₁/P₂), as a mesure of effect B, was less than log(P₁/P₂) and decreased with the increaase in heat-setting temperature, where Po is the dye penetration coefficient on the dyeing in the absence of the carrier using the fibers without carrier pretreatment. A linear relation was observed between log(P₁/P₂) and the contraction on the carrier pretreatments.