Abstract
The changes in structure and dyeability characteristics of: a) polyethylene terephthalate (PET) yarn, textured at different tensions and various twist levels; and b) the textured samples after being relaxed in water at 80°C for 2 hours, are reported. The crystallinity of all textured samples was found to be higher than that of the untextured yarn, but in general, crystallite orientation, birefringence, and amorphous orientation decreased on texturing. The effect of tension and twist on these structural parameters is discussed in this paper. The textured samples, after being relaxed, show decrease in crystallinity, crystallite orientation, birefringence, and amorphous orientation. The dye uptake of the textured samples is considerably affected by tension in the crimping zone, and water treatment increases the dye uptake of the textured yarn. The structural dependence of dye-uptake data is analyzed.
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