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Temperature-induced crystalline phase transitions in neat nylon 6 fibers as well as nylon 6/montmorillonite nanocomposite fibers have been studied by means of wide-angle X-ray scattering. Both types of melt spun fibers only consist of the γ crystalline phase that does not display any transition during heating up to the melt. In contrast, fibers drawn up to the maximum draw ratio at 140°C display the...