The kinetic and thermodynamic parameters of dyeing of polypropylene/Clay composite fibers using disperse dye

The physicochemical parameters of dyeing of PP/Clay composite fiber with disperse dye are investigated in terms of sorption isotherm, standard affinity, enthalpy and entropy changes, diffusion coefficient as well as activation energy of the diffusion. Results are then compared with corresponding properties of the virgin polypropylene fiber. The sorption of disperse dye on PP/Clay composite and polypropylene fiber shows the linear isotherm. The standard affinity of dye to PP/Clay fiber is noticeably higher than that to the virgin polypropylene fiber, while the dyebath containing virgin fiber reveals the higher negative values of the enthalpy and entropy changes than corresponding factors for the dyebath containing composite fiber. For PP/Clay fiber, the value of diffusion coefficient of dye molecules increases with the dyeing temperature. The activation energy of diffusion of dye into the composite fiber is significantly higher than that into the virgin fiber. (C) 2012 Elsevier Ltd. All rights reserved.