Two-dimensional correlation analysis of variable-temperature Fourier-transform near-infrared spectra of an amorphous polyamide

Wu, Peiyi; Siesler, Heinz W.
March 2000
AIP Conference Proceedings;2000, Vol. 503 Issue 1, p18
Academic Journal
Near-infrared (NIR) spectra of a totally amorphous polyamide measured over the temperature range from 25 °C-200 °C were analyzed using generalized two-dimensional (2D) correlation spectroscopy. At least five distinct bands at 5690, 5810, 5900, 5980 and 6010 cm-1 were identified in the region of the v(CH) overtones (5400-6100 cm-1). Among them, two bands at 5810 cm-1 (aliphatic CH) and 6010 cm-1 (aromatic CH) were found to be very sensitive to the temperature-induced structural changes of the polyamide under examination. In the v(NH) overtone region (6300–6800 cm-1), the asynchronicity of the bands assigned to the vibrations of the free and hydrogen-bonded NH groups indicates a complicated dissociation mechanism and the existence of different hydrogen-bonded species in the investigated totally amorphous polyamide sample. Owing to the spectral resolution enhancement in the 2D correlation spectra, a splitting of the first v(NH) overtone of free NH groups into two components at 6780 cm-1 (totally free) and 6740 cm-1 (free-end) can be observed. © 2000 American Institute of Physics.


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