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 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 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 overtone of free NH groups into two components at 6780 cm−1 (totally free) and 6740 cm−1 (free-end) can be observed.
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10 March 2000
TWO-DIMENSIONAL CORRELATION SPECTROSCOPY
29 Aug - 1 Sep 1999
Kobe-Sanda (Japan)
Research Article|
March 10 2000
Two-dimensional correlation analysis of variable-temperature Fourier-transform near-infrared spectra of an amorphous polyamide Available to Purchase
Peiyi Wu;
Peiyi Wu
Department of Physical Chemistry, University of Essen, D 45117 Essen, Germany
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Heinz W. Siesler
Heinz W. Siesler
Department of Physical Chemistry, University of Essen, D 45117 Essen, Germany
Search for other works by this author on:
Peiyi Wu
Department of Physical Chemistry, University of Essen, D 45117 Essen, Germany
Heinz W. Siesler
Department of Physical Chemistry, University of Essen, D 45117 Essen, Germany
AIP Conf. Proc. 503, 18–30 (2000)
Citation
Peiyi Wu, Heinz W. Siesler; Two-dimensional correlation analysis of variable-temperature Fourier-transform near-infrared spectra of an amorphous polyamide. AIP Conf. Proc. 10 March 2000; 503 (1): 18–30. https://doi.org/10.1063/1.1302844
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