Thermodynamic Parameters and Dyeing Kinetics of Wool Yarn With Aqueous Extract of Rubia Tinctorum L

Abstract

Wool yarn have been dyed with colorant extracted from of Rubia tinctorum L in the absence and presence of potassium aluminum sulphate and acetic acid mordant and under the optimum conditions (Dyeing of wool yarn under the optimum conditions natural pH, treatment time 1 hour, and temperature 94-98oC). It is found that the producing shades of the small different colours, ranging from red to dark red. The Kinetic and thermodynamic studies on the uptake by wool yarn have also been carried out. It is observed that this dyeing process is endothermic and spontaneous adsorption. During the dyeing process the ΔH is positive that this implies an uniform ordered distribution of dye on wool yarn.