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Two-Dimensional Correlation Spectroscopy (2D-COS) Analysis of Near-Infrared (NIR) Spectra of Hydrogen-Bonded
Rena Tajima1, Shintaro Nakagawa1, Naoko Yoshie1
1Institute of Industrial Science, The University of Tokyo, Komaba 4-6-1, Meguro-ku, Tokyo 153-8505, Japan.
Abstract:
We investigated the deformation mechanism of a phenyl urazole-functionalized polybutadiene elastomer crosslinked via hydrogen bonds (H-bonds) using rheo-optical near-infrared (NIR) spectroscopy and two-dimensional correlation spectroscopy (2D-COS). The elastomer sample experienced tensile deformation while being probed by a high-speed NIR spectrometer equipped with an acousto-optic tunable filter (AOTF). The main feature of the NIR spectra of the elastomer sample is a change in the intensity of a broad peak consisting of multiple sub-peaks each reflecting different states of H-bonding. The NIR spectra were then subjected to 2D-COS analysis to resolve overlapping H-bonding bands, enabling their sequential structural evolution to be determined. Asynchronous analysis suggested that the deformation of H-bonds in the soft matrix likely precedes the disruption of rigid aggregates. This study demonstrates the utility of 2D-COS-assisted rheo-optical NIR spectroscopy in revealing the behavior of H-bonds in elastomers under stress.
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