Dyeing equilibrium parameters of polypropylene/Clay composite fibers with disperse dyes

Polypropylene (PP) is a fiber-forming polymer which is greatly used in wide range of textile production. Despite bearing many great mechanical and chemical properties as well as low cost, the polymer has no acceptable dyeability using classical dyeing methods which are of importance in textile industry. To overcome the problem, many attempts have been made based on physical and chemical modification of polypropylene. The serious disadvantage of these approaches is to increase the cost of products.Recently, incorporating clay nanoparticles into polypropylene matrix as a commercial and effective way to impart dyeability to polypropylene has been suggested. The proposed method could considerably improve dyeability of the polymer with classical dyeing methods. This improvement, however, was examined by several researchers using an unsuitable criterion, i.e. K/S value, which is unable to project what specifically happening in dyeing system [۱].In this study, therefore, we investigate the dyeing mechanism and dyeability of polypropylene fibers incorporated by clay nanoparticles with a disperse dye in terms of some thermodynamic parameters such as standard affinity, enthalpy and entropy changes of dyeing bath as well as the equilibrium adsorption isotherm, which have not been reported by other researchers on PP/Clay composite fibers.

کلیدواژه ها:

Thermodynamic parameters ، Dyeing ، PP/Clay composite fibers ، Disperse dye.