抄録
By using p-aminoazobenzene, p-nitroaniline and p-nitrodimethylaniline as models of disperse dye, the dyeing mechanism of benzalized vinylon was studied and compared with the data of an earlier paper for formalized vinylon.
It took a very long time to obtain the dyeing equilibria on benzalized vinylon. Benzalized vinylon acts as solvent of disperse dyes as well as formalized vinylon.
Partition coefficients of three dye models increase in proportion to the degree of benzalization of the fiber. This fact has not been observed in the case of dyeing formalized vinylon, and the cause of such a difference is discussed.
In order to caluclate affinities of disperse dyes on benzalized vinylon, a correcting coefficient, a function of the degree of benzalization, was introduced into Majury's equation.
p-Nitrodimethylaniline indicates higher affinities on benzalized vinylon than on formalized vinylon, and affinities of the other models on benzalized vinylon are nearly equal to these values on about 25mol% formalized vinylon.
With regard to heats of dyeing and entropy changes on benzalized vinylon, the value of p-nitroaniline is higher than that on formalized vinylon, but the other models indicate lower values rather than those on formalized vinylon, especially their entropy changes are minus values which is not observed in the case of dyeing of formalized vinylon.
