Abstract
Dye solution (Orange II) from an infinite dyebath was passed through a semi-micro textile assembly (silk fibroin, 10-30mg) placed in a glass column (3mm diameter) at constant temperature. The change in the dye consentration after passing through the assembly was measured continuously by means of photometry. The data obtained from such measurement allows to draw the curve of dyeing rate from the infinite bath.The value of the apparent diffusion coefficient of dye in the fiber (Dw) and the equilibrium uptake of the dye (M∞) were estimated from the curve of dyeing rate by means of non-linear least squares method. The value of Dw was increased as the amount of the specimen placed in the tube (W) was decreased, but the value of M∞ was almost constant regardless of W. The value of Dw extrapolated to W→O may be regarded as the true diffusion coefficient (Do). The value of activation energy of diffusion calculated using Do or various Dw was almost constant.
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