Comparative Variable Temperature Studies of Polyamide II with a Benchtop Fourier Transform and a Miniature Handheld Near-Infrared Spectrometer Using 2D-COS and PCMW-2D Analysis.
The main objective of this communication is to compare the performance of a miniaturized handheld near-infrared (NIR) spectrometer with a benchtop Fourier transform near-infrared (FT-NIR) spectrometer. Generally, NIR spectroscopy is an extremely powerful analytical tool to study hydrogen-bonding changes of amide functionalities in solid and liquid materials and therefore variable temperature NIR measurements of polyamide II (PAII) have been selected as a case study. The information content of the measurement data has been further enhanced by exploiting the potential of two-dimensional correlation spectroscopy (2D-COS) and the perturbation correlation moving window two-dimensional (PCMW2D) evaluation technique. The data provide valuable insights not only into the changes of the hydrogen-bonding structure and the recrystallization of the hydrocarbon segments of the investigated PAII but also in their sequential order. Furthermore, it has been demonstrated that the 2D-COS and PCMW2D results derived from the spectra measured with the miniaturized NIR instrument are equivalent to the information extracted from the data obtained with the high-performance FT-NIR instrument.
Physical Electronics GmbH, Ismaning, Germany Anasys Instruments, Santa Barbara, CA, USA miriamunger@gmx.de.
Miriam
M
Unger
Department of Physical Chemistry, University of Duisburg-Essen, Essen, Germany.
Frank
F
Pfeifer
Department of Physical Chemistry, University of Duisburg-Essen, Essen, Germany.
Heinz W
HW
Siesler
Fourier transform infrared spectroscopy (FT-IR); Fourier transform near-infrared spectroscopy (FT-NIR); Near-infrared (NIR); Polyamide II; handheld NIR spectrometer; hydrogen bonding; perturbation correlation moving window two-dimensional (PCMW2D) analyses; recrystallization; two-dimensional correlation spectroscopy (2D-COS); variable temperature NIR spectroscopy