Abstract
The effect of methylacrylate (MA) on dyeing acrylonitrile/MA copolymer fibers with cationic and disperse dyes was studied at equilibrium. The fibers were spun from copolymers having MA content varied from 2 to 14% by weight and were found to increase with increasing MA content. Irrespective of MA content, saturation values for the cationic dyes became equivalent to the content of the strong acid group of the fibers. The weight fraction of the fiber structures molten at the heat-treating temperatures, mf (T), was calculated according to the kinetics of copolymerization and the depression of melting temperature as a function of the AN sequence. The increasing behavior of the partition coefficient for the disperse dyes has heen satisfactorily interpreted on the basis that the internal volume for the disperse dyeing increases by the molten volume increment calculated from mf (T).
