Molecular interaction of polyimide films probed by using soft-pulse dynamic compression ATR time-resolved infrared and double Fourier-transform based 2D-IR spectroscopy |
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Affiliation: | 1. Department of Cardiology, University Hospital Basel, Switzerland;2. Department of Internal Medicine, University Hospital Basel, Switzerland;3. Department of Cardiology, King Saud Medical City, Tanta University, Riyadh, Saudi Arabia;4. Emergency Department, San Martino Hospital, Genova, Italy;5. Servicio de Laboratorios, Hospital del Mar—IMIM, Barcelona, Spain;6. Brahms Thermo Fisher, Hennigsdorf, Germany |
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Abstract: | An improved time-resolved step-scan Fourier transform rheo-optical system, based on the soft-pulse dynamic compression attenuated total reflection (ATR) approach, has been introduced to analyze inter-molecular interactions of poly(p-phenylene bi-phenyltetracarboximide) (BPDA–PDA) and poly(N,N-diphenyl ether bi-phenyltetracarboximide) (BPDA–ODA) films. In order to extract the full range of frequency distributions obtained from soft-pulse dynamic compression time response (relaxation) spectra, the second-Fourier transformation was applied along the relaxation time axis in addition to the interferogram axis. In the case of the BPDA–PDA, distinct periodic higher overtone bands are observed especially at C=O stretching and C=C tangential stretching vibration bands in the FFT relaxation time contour map spectra. For the BPDA–ODA, intensities of higher overtone bands are relatively weak. We have further performed 2D-IR correlation analysis at given Fourier frequencies, which includes molecular interaction information. The results suggest that the existence of molecular interaction between C=O stretching and C=C tangential stretching vibration bands. |
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Keywords: | Step-scan FT-IR spectroscopy Soft-pulse compression Rheo-optics Time-resolved spectroscopy Polyimide Two-dimensional infrared spectroscopy |
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