Nanostructure changes in nylon 5,6 fibers under tension owing to hydrogen bond formation
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초록
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We investigated the effect of tension on the stable α-phase formation of nylon 5,6 fibers with two different drawing speeds using two-dimensional transmission wide-angle X-ray scattering measurement. In an ex-situ condition, i.e., after releasing the applied tension and temperature, the relative amount of the α-phase in the fibers was higher at a higher drawing speed. On the contrary, the development of the α-phase seemed faster and stronger during in-situ elongation of the fiber at a lower drawing speed. The γ-phase, rather than the α-phase, played a key role in this complex behavior. The mechanical properties of the nylon fibers elongated under slow drawing speed were better than those elongated under a higher drawing speed. The mechanical properties were more consistent in the case of α-phase formation in an in-situ condition under applied tension on the nylon fibers.