The dyeing process of poly(ethylene terephthalate) (PET) and 2,5-cellulose diacetate (CA) fibers at 40-100 degrees C using supercritical carbon dioxide (CO2SCF) as solvent system has been kinetically investigated in relation to the morphological modifications induced by the CO2SCF 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 CO2SCF and in hot air evidenced that CO2SCF has a plastifying action towards PET by lowering its T-g value to 0-5 degrees C and thus favoring the dyeing process at loll, temperature. Such effect was not observed with CA. (C) 1998 Elsevier Science Ltd. All rights reserved.
Morphological changes and dye uptake of poly(ethylene terephthalate) and 2,5-cellulose diacetate immersed in supercritical carbon dioxide / P. Beltrame, A. Castelli, E. Selli, L. Villani, A. Mossa, A. Seves, G. Testa. - In: DYES AND PIGMENTS. - ISSN 0143-7208. - 39:1(1998), pp. 35-47.
Morphological changes and dye uptake of poly(ethylene terephthalate) and 2,5-cellulose diacetate immersed in supercritical carbon dioxide
E. Selli;
1998
Abstract
The dyeing process of poly(ethylene terephthalate) (PET) and 2,5-cellulose diacetate (CA) fibers at 40-100 degrees C using supercritical carbon dioxide (CO2SCF) as solvent system has been kinetically investigated in relation to the morphological modifications induced by the CO2SCF 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 CO2SCF and in hot air evidenced that CO2SCF has a plastifying action towards PET by lowering its T-g value to 0-5 degrees C and thus favoring the dyeing process at loll, temperature. Such effect was not observed with CA. (C) 1998 Elsevier Science Ltd. All rights reserved.
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