THE INFLUENCE OF QUATERNIZED POLY (VINYLPYRIDINE)S ON THE DIFFUSION OF 4-AMINOAZOBENZENE DERIVATIVES AND METHYL ORANGE HOMOLOGS IN NYLON 6

Abstract

For nylon 6-acetate buffer solutions at pH 5.7 the diffusion coefficient, D and the equilibrium dye concentration, Cs of 4-aminoazobenzene (D-I) and 4-[bis (2-hydroxyethyl)amino] azobenzene (D-II) were determined at 35°C by permeation experiments.The solutions contained poly (N-butyl-4-vinylpyridinium bromide) (C4P4VP) (degree of quaternization, DQ=100%) or poly (N-octyl-2-vinylpyridinium bromide) (C8P2VP) (DQ=42.6%).With the addition of C4P4VP or C8P2VP in the dye bath, Cs decreases, but D does not change. By assuming a constant partition coefficient between the free dye concentration in the bath, Cf and Cs, the apparent binding constants, Kapp of the dyes to the polymers were estimated.The apparent diffusion coefficients, Dapp of methyl, ethyl and butyl orange (MO, EO and BO) in nylon 6 were determined at 35°C by means of desorption method using an acetate buffer solution containing C4P4VP or sodium poly(styrenesulufonate) (PSSNa) (degree of sulfonation, DS=100%). Dapp values of the dyes increase with the addition of C4P4VP and decrease with PSSNa. Such behaviors were discussed based on a theory of fixed charge membranes.