Dyeing transition temperature of wools treated with low temperature plasma, liquid ammonia, and high-pressure steam in dyeing with acid and disperse dyes

Wool fibers treated with oxygen low-temperature plasma, liquid ammonia (NH3 ), and high-pressure (HP) steam were dyed with two acid and three disperse dyes. Rate of dyeing, saturation dye uptake, and dyeing transition temperat ure were measured. Rate of dyeing of the O-2 plasma, NH3, and HP steam-trea ted wools increased with acid dyes, whereas it did not increase with disper se dyes. Although dyeing transition temperature for acid dyes was decreased by the plasma, NH3, and HP steam treatments, the temperature for disperse dyes was not changed by the treatments. Therefore, it seems that acid dyes penetrate by the intercellular diffusion through the interscale Cell Membra ne Complex (CMC) of wool, whereas disperse dyes penetrate by the intracellu lar diffusion through the intrascale cuticle surface independently with CMC relaxation by the treatments. (C) 2001 John Wiley & Sons, Inc.