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 CH₂ 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. © 2004 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 42: 4017–4022, 2004