Abstract
Sorption behavior of Shellac, which is of natural thermosetting resin, on wool fibers and enzymatic degradation of Shellac-modified wool fibers were investigated. Although immersed temperature had little effect, Shellac exhaustion depended on Shellac concentration, treatment time, the number of treated times, and also on the nature of solvents. Using methanol for a solvent, the amount of sorbed Shellac was obtained maximum about 0.03g/g-wool and decreased with increase of the molecular weight or size of the alcohol from methanol to t-butanol. The weight loss by enzymatic degradation for wool fibers could be controlled effectively by the sorption of Shellac. From SEM observation of surface morphology of Shellac-modified wool fiber and fractures morphology when extended to break, it was found that Shellac sorbs selectively into the cuticle intercellular regions and affects the strength of cell adhesion. From differential scanning calorimetric curves for untreated wool fiber and wool fiber treated for different treatment time in Shellac methanol solution, it was suggested that the Shellac was sorbed within the cell membrane complex and followed by gradual penetration into the cortex cell, under the treatment conditions of the solvents with smaller molecular weight or size.
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