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Polyester fiber was pretreated with organic solvent/water solutions of various compositions. The organic solvents used in this experiment were benzyl alcohol, n-butanol, and N, N-dimethylformamide (DMF). The dyeing behaviors of the pretreated fibers with 1, 4-diaminoanthraquinone in water were studied with reference to changes in the fine structure of the fibers. Also density and X-ray diffraction of the fibers were investigated as a measure of crystallite region. The dye uptake increased in the order, fiber pretreated with water<untreated fiber<fiber pretreated with aqueous 5% benzyl alcohol solution<fiber pretreated with benzyl alcohol<fiber pretreated with aqueous 90% benzyl alcohol solution for benzyl alcohol; fiber pretreated with water<untreated fiber_??_fiber pretreated with aqueous 5% butanol solution<fiber pretreated with butanol<fiber pretreated with aqueous 90% butanol solution for butanol; and fiber pretreated with water_??_fiber pretreated with aqueous 5% DMF solution<untreated fiber<fiber pretreated with aqueous 90% DMF solution<fiber pretreated with DMF for DMF, indicating that the dye uptake increases with the increase in the crystallite growth. This might be due to the fact that the recrystallization process during the pretreatment with organic solvent/water solutions leads to an increase in the amorphous volume and then a large increase in the dye uptake. Also the rate of dye absorption increased and the dyeing transition temperature decreased with the pretreatments. The results obtained are briefly discussed in terms of the plasticization of the fiber structure formed during the pretreatment.

CHANGE IN FINE STRUCTURE AND DYEING BEHAVIOR OF POLYESTER FIBER TREATED WITH ORGANIC SOLVENT/WATER