DYEING OF CELLULOSE BY A DIRECT DYE IN AQUEOUS SODIUM POLY(STYRENE SULFONATE) SOLUTION

In the previous paper, we have studied the dyeing of cellulose by Chrysophenine G (C. I. Direct Yellow 12) in aqueous sodium alginate solution and have concluded by the membrane equilibrium theory that the dye ion is concentrated into the internal solution of fiber due to the presence of sodium alginate in the bulk solution. Sodium alginate is subject to hydrolysis during the course of dyeing, which may make the interpretation somewhat dubious. In the present study we have chosen sodium polystyrene sulfonate (NaPSS) as a synthetic polyelectrolyte which is not subject to hydrolysis and have studied the dyeing of cellulose by Chrysophenine G in aqueous NaPSS solution. It is found that our model assumed in the previous paper explains the obtained results by assigning an appropriate degree of dissociation of sodium ion to NaPSS in solution.