Interaction of Wool-Keratine Membrane with Methyl Orange and It's Homologs over the Temperature Range 60~9$0^{\circ}C$

양모―케라틴 유도체막과 메틸오렌지 및 그 동족체와의 고온영역에서의 상호작용

In order to study the dyeability of wool S-cyano ethylated wool-keratine(SCEK) as a model compound of wool was prepared from the reaction of reduced merino wool fiber and acrylonitrile. The binding of acid dyes(methyl orange and it's homologs) by SCEK over the temperature 60~9$0^{\circ}C$ were investigated. The first binding constants and the thermodynamic parameters in the course of the binding were evaluated. It was found that at the 60~9$0^{\circ}C$ range complex formation between the dye and SCEK is associated with an exothermic enthalpy change and a positive entropy change. The enthalpy and entropy changes of the binding are of the order of -4.5 kcal/mole and 8.5 eu, respectively, for each dye measured. Thus the binding is mainly enthalpy-controlled. Furthermore the effect of the alkyl chain length of the dye on both the ΔH$^{\circ}$and ΔS$^{\circ}$value is not prounced. Also temperature dependences of the ΔH$^{\circ}$and ΔS$^{\circ}$values were not obserbed.