Abstract
The dyeing process of poly(ethylene terephthalate) (PET) and 2,5-cellulose diacetate (CA) fibers at 40–100°C using supercritical carbon dioxide (CO 2SCF) as solvent system has been kinetically investigated in relation to the morphological modifications induced by the CO 2SCF treatment in these fibers, determined through DSC, X-ray diffraction, SEM analysis and shrinkage measurements. A comparison between the effects of annealing both polymer fibers in CO 2SCF and in hot air evidenced that CO 2SCF has a plastifying action towards PET by lowering its T g value to 0–5°C and thus favoring the dyeing process at low temperature. Such effect was not observed with CA.
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