Anionic modified and normal poly(ethylene terephthalate) yarns were heat set at temperatures from 100 to 220°C and times from 3.75 to 45 seconds. Tensile properties, critical dissolution times, and dye sorption of these yarns were examined as a function of time and temperature of heat stabilization. Melting behavior (DSC thermograms), thermal stress, and critical dissolution times vary as a function of time and temperature of heat setting in the same way for both cationic dyeable and normal PET yams.
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