Crystalline transition of polyamide‐10,20 investigated by in situ Fourier transform infrared spectroscopy

Real‐time Fourier transform infrared spectroscopy was used to investigate the crystalline transition of even–even polyamide‐10,20. During the crystalline transition, the intensity of the hydrogen bonds became weak, the twisting of the CCO and CN bonds improved, and the gauche conformation of the CH 2 sequences increased, along with the strengthening of the vibration of the methylene units. The ordered stacking of methylene segments with the trans‐zigzag conformation gradually became disordered by the insertion of the gauche conformation upon heating.