Fluid Density Dependency of the Partition Coefficient of Disperse Dyes between Synthetic Fiber and Supercritical CO_2 in Super- critical Dyeing

摘要

The poly(ethylene telephthalate)(PET) and polypropylene (PP) fibers were dyed with two different disperse dyes in supercritical car- bon (scCO_2) fluid. The partition coefficients (K) of dyes between polymer phase and scCO_2 phase were calculated from the equiliburium dye uptake and the solubilities of dyes in scCO_2. A linear relation was found in the plots of the logK vs. logPF (scCO_2 density). The slope roughly depended on solvation number of dye in scCO_2 for all polymer-dye systems.