DYEING OF CELLULOSE BY DIRECT DYE IN AQUEOUS SODIUM ALGINATE SOLUTION

概要

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Dyeing of Cotton by Chrysophenine G (C. I. Direct Yellow 12) in aqueous sodium alginate solution has been studied. The results show the increasing dye absorption with increasing sodium alginate as described before. In this report, the results have been interpreted by reference to the parameters affecting the free energy of the dyeing and the relevant model available for explaining this dyeing system. The effect of sodium alginate (polyelectrolyte) on the absorption equilibrium of dye by cotton has been compared with that of sodium chloride (inorganic salt) in terms of the Donnan membrane equilibrium theory, assuming that sodium alginate is present only in the "bulk solution" defined in the unimolecular absorption model of cellulose. We have considered that dyeing of cotton by direct dye in aqueous sodium alginate solution is similar to the dyeing in the absence of foreign electrolyte and that by the membrane equilibrium the dye has been concentrated into the internal solution of cotton for the presence of sodium alginate in the bulk solution.
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