Abstract
To study the mechanism of the interaction between anionic dyes and basic vinyl compounds, the adsorption isotherm of the dye on the film of poly-2-vinyl pyridine and the changes of the absorption spectra of dyes by the addition of poly-2-vinyl pyridine or 2-vinyl pyridine were pursued. The results are as follows:
1. Anionic dye solutions are dissociated to monomer ion and polymer ion. The association equilibrium changes toward the increase of polymer ion by the addition of poly-2-vinyl pyridine or 2-vinyl pyridine. And this change is further promoted with poly-2-vinyl pyridine than with 2-vinyl pyridine.
2. Monomer ion and polymer ion formed in this result are adsorbed respectively on poly-2-vinyl pyridine and 2-vinyl pyridine by the salt forming reaction.
3. When C. I. Acid Red 88 is used as anionic dye, it is dissociated to monomer ion and dimer ion, and monomer ion produces a new metachromacy by adsorbing poly-2-vinyl pyridine.
