Dyeing Properties of Polyester Microfibers

Abstract

Sorption isotherms and dyeing rates of purified disperse dyes on polyester microfibers (fineness of 0.25-1.0 denier) from water have been measured at 95°C. The isotherms are curved and well described in terms of the dual-mode sorption model: Nemst-type partitioning and Langmuir sorption are concurrently operative. The effect of a diffusional boundary layer on the dyeing rate is small under the conditions; the microfibers were dyed in the form of a bulky two-ply yarn in a well stirred bath. Dyeing rates of a commercial dye are also measured at 110 and 130°C. For dyeing of a 0.32d fiber at 130°C, the amount of dye sorbed by the fibers attains a maximum value at an early stage and then decreases gradually. This phenomenon is explained in terms of the aqueous solubility of very fine dye particles. The relation between dye sorption behavior and the fine structure of the microfibers is discussed.

Variations in diffusion coefficient of disperse dyes in single PET fibres: monitored and interpreted by confocal laser scanning microscopy

“…The variation in D for the diffusion of AQ dye in the fibre at 100 and 110 8C may either be due to a radial heterogeneity of the fibre morphology at the measured temperatures or due to a concentration dependence of D as with increasing penetration depth the concentration of present dye is also lower. Literature [3,4,10,11,16,17] relating to the diffusion of dyes in polymers usually regards the diffusion coefficient as a constant at a certain temperature for reasons of simplicity, although some authors reported the concentration dependence of D [6,25,26].…”

“…This however, disregards the appreciable differences in morphology between fibres and other materials like films of the same polymer [13,14]. Another approach described in literature [3,4,12,[15][16][17][18][19][20][21], determines the apparent diffusion coefficient by monitoring the total mass transport from the dyebath in the polymer during isothermal dyeing processes. The latter has the advantage that it can be used on fibres or fabrics but it lacks the visualisation of dye transport within the polymer as one may obtain by concentration-distance profiles.…”

Draw-Texturing of Microfiber Polyester Yarn

“…Change in surface, area due to finer denier wiU also affect the dye exhaustion of textured polyester. Nakamura et al [ 8 ] have also discussed the relation between dye abdorption behavior and the fine structure of the microfibers. F'igure 7 shows that dye uptake first decreases and then increases with texturing temperature.…”

Exhaust dyeing of polyester‐based textiles using high‐temperature–alkaline conditions

“…The K/S values of the resultant dyeings, the percent increase in the K/S values, as well as the fastness properties of these dyeings are determined by the nature of disperse/reactive combination, that is, the molecular weight, chemical structure, extent of aggregation and agglomeration, extent of solubility, diffusion and penetration, degree of stability, energy level of the disperse dye, dye affinity, migration power, in addition to compatibility with each other as well as with other ingredients in dyeing formulations. 27,33,38,42,43 4. Generally speaking, the fastness properties' ratings of the dyed samples, in the presence of TEOHA (0.5 ows), are rated quite highly, especially in the case of using Dianix Blue AD-R/ Procion Saphire HEXL and Dianix Yellow AD-G/Procion Flavine HEXL combinations.…”