Abstract
The swelling region of cellulose triacetate fiber in organic solvents was examined on the basis of the volume term for dye adsorption. Cellulose triacetate fiber swollen in various solvents in the equilibrium states was transferred by solvent exchange into cyclohexane maintaining the swelling region in the solvents, and then the equilibrium adsorption of C. I. Disperse Red 15 from cyclohexane on cellulose triacetate fiber was estimated. The adsorption isotherms obey the distribution law. The relative volume term obtained from the partition coefficients (Cf/Cs, Eq. [1]) by assuming constant affinity reflects the swelling region of cellulose triacetate fiber in the solvents. The swelling region is explained by the interaction and steric effect of solvent. This finding supports the lateral order distribution in the amorphous region of cellulose triacetate fiber.In addition, the affinity of C. I. Disperse Red 15 to cellulose triacetate fiber obtained in solvent dyeing was corrected with the volume term.
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