Abstract
The activity coefficients of disperse dyes, such as azobenzene (AB) and p-hydroxy-p'-phenylazoazobenzene (HP), in alcohols having a series of alkyl groups (methyl to n-butyl) were determined by means of isopiestic measurements at concentrations from 2×10-3 to 2× 10-2 mol kg-1 at 40°C. It has been found that the activity coefficients of AB and HP were smaller than unity, and decreased with increasing carbon number of alkyl groups of the alcohols used as solvents. The coefficients of AB were smaller than those of HP. The results has been interpreted on the basis of the interactions between dye and alcohols.
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