AbstractAn absorption band found at 974 cm−1in the infrared spectra of “amorphous” nylon 6 films has been assigned to CH2wagging or twisting vibrations in molecular chain folds. Annealing amorphous films in air at increasing temperatures up to 150°C has been shown to induce a steady increase in the intensity of the absorption band at 974 cm−1. Annealing at higher temperatures resulted in a sharp decrease in intensity up to an annealing temperature of 210°C. This sharp decrease coincided with a sharp increase in the long period determined by low‐angle x‐ray diffraction studies. Drawing amorphous films has been shown to induce a decrease in the intensity of the band at 974 cm−1. Polarized infrared investigations of amorphous drawn films revealed that the band at 974 cm−1was strongly perpendicular in character. Treatment of amorphous films in water induced no frequency change in the
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