Studying the Adsorption Behavior of a Disperse Dye on Polyethylene Terephthalate in Absence and Presence of a Nanostructured Hyperbranched Polymer

Dyeing properties of modified polyethylene terephthalate with a polyesteramide hyperbranched polymer (hp) were investigated in terms of their thermodynamic parameters, including standard affinity (-δμ^0), enthalpy change (δh^0) and entropy change (δs^0). results were then compared with corresponding properties of the virgin pet. the results showed that the isotherms were similar to that of virgin pet following as linear isotherm. the standard affinity of the dye to the modified samples showed higher value than that of virgin pet. the standard affinity of dye to the pet increased by the content of hp. the bath containing virgin pet displayed the highest negative values of the δh^0 and δs^0, while that of the pet with 2% hp showed the lowest negative value. the surface structure and thermal behavior of the samples were determined by ftir and dsc, respectively. dsc tests showed that the crystallinity and glass transition temperature of samples were decreased.