Studies on the drawing of polyamide fibers. III. Change of dye‐diffusion behavior into polyamide fibers with drawing

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Abstract
The diffusion constants of an acidic dye (Xylene Fast Blue P) into nylon 6 monofilaments of various draw ratios have been measured at several temperatures by measuring the distance of dye penetration into the cross‐sections of the sample. The results are as follows. The diffusion coefficient of dye increases, reaches a maximum at a draw ratio near 1.6, and then decreases as the draw ratio increases. The activation energy of dye diffusion obtained from the temperature dependence of dye diffusion coefficient remains nearly constant in the initial and middle stages of drawing and increases above a draw ratio of about 3, as the draw ratio increases. The change in the polymer structure during drawing is discussed on the basis of these results.

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