| Popis: |
The sorption by nylon at pH values from 3 to 10 of dyes based on a-naphthylamine→β-naphthol, which have different degrees and positions of sulphonation, has been measured. Yarns of different amine end-group contents and with different basic stabilizers have been used. At all pH sorption is directly dependent on amine end-group content. Increase in the degree of sulphonation decreases the number of equivalents of the dye which are sorbed. The characteristics of the pH-dependence of the sorption are related, inter alia, to the basicity of the basic end-group in the yarn and to the potentiometric titration curve of the dye acid. |
