Thermodynamic parameters of disperse dyeing on several polyester fibers having different molecular structures

Dyeing properties of the easy dyeable polyester (EDP) and the polytrimethylene terephthalate (PTT) were investigated in terms of their thermodynamic and kinetic factors, such as standard affinity (-Delta mu(0)), enthalpy change (Delta H-0), entropy change (Delta S-0), diffusion coefficient (D-T) and activation energy of the diffusion (E-D). The results were compared with corresponding properties of the PET (polyethylene terephthalate). The -Delta mu(0) of the EDP and the PTT showed a little higher value than that of the PET. PET displayed the highest negative values of the Delta H-0 and the Delta S-0, while PTT showed the lowest negative values of them. For all three polyester types. as the temperature increased, the D-T increased. PTT had the highest D-T at every temperature and PET showed the lowest values of the D-T. The E-D of the EDP and the PTT was lower than that of the PET. (c) 2005 Elsevier Ltd. All rights reserved.