分散染料とポリプロピレン繊維との相互作用

抄録

The absorption isotherms of four disperse dyes for polypropylene fibers were determined at various temperatures. The affinity, heat of dyeing and entropy of dyeing were calculated from the thermodynamical treatment. The heasts of all four dyes investigated were all negative, so the binding process was exothermic. The affinity of the dye for polypropylene was found to increase with the increase in the hydrophobic character of the dye. The increase in the hydrophobic character of the dye, however, causes the decrease in the heat and entropy of dyeing. This result shows that the higher affinity of the hydrophobic dye comes from the decrease in the entropy of dyeing. From a consideration of the thermodynamical data, it is assumed that the breakdown of so called “iceberg” water structure in the vicinity of the hydrophobic dye takes place in the course of the binding process. The interaction between polypropylene fibre and disperse dye is explained by using the following concept that the binding process involves two main effects: (1) an exothermic interaction (may be dispersion force) (2) an entropic interaction (the formation of a so called. “hydrophobic bond”)