Abstract
The results of WAXS and SAXS on the surface layer of nylon monofilaments which were twisted repeatedly at high temperature are reported. The (002) reflections for nylon 6 or the (010) reflections for nylon 610 were gradually split into the double peak by increasing the number of S direction twist repetition. The direction of split reflections has been corresponded to kink band direction. The WAXS and SAXS patterns of the filaments twisted and untwisted repeatedly towards one direction corresponded to the single texture pattern. When the filaments were twisted towards the opposite direction after being twisted repeatedly towards one direction, the (002) or (010) reflections became broad arcs in the same positions. Simultaneously SAXS patterns changed to the two point patterns on the meridian and the long period value decreased by the continuous deformation.The changes of these X-ray diffraction patterns may be related to the relaxation of the lamellar structure in the fibrils deformed to the single texture by the repeated twisting procedure. However, it is difficult to correlate these changes with the morphological changes in nylon filament described in our previous paper.
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