Journal
VIBRATIONAL SPECTROSCOPY
Volume 88, Issue -, Pages 49-55Publisher
ELSEVIER
DOI: 10.1016/j.vibspec.2016.11.001
Keywords
Fourier transform infrared (FTIR); spectroscopy; Two-dimensional (2D) correlation; spectroscopy; Polyethylene glycol (PEG); Polypropylene glycol (PPG)
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Non-equilibrium behavior of liquid mixture of polyethylene glycol (PEG) and polypropylene glycol (PPG) is studied. During the phase variation of PEG/PPG mixture, time-resolved Fourier transform infrared (FTIR) spectra were collected by attenuated total reflection (ATR) technique to selectively capture the development and subsequent variation of PEG-rich phase, appearing within a layer of the sample adjacent to the measuring surface of the ATR diamond prism. The FTIR spectra were then subjected to a two-dimensional (2D) correlation method to elucidate subtle but important changes in the absorbance of spectral bands. 2D correlation spectra revealed fine details of the non-equilibrium system. During the phase variation, dissociation between PEG and PPG generates free PEG molecules first. The emergence of the free PEG molecules triggers the subsequent self-assembly via the development of intermolecular H-bonding between PEG molecules, which eventually generates bigger PEG aggregates. (C) 2016 Elsevier B.V. All rights reserved.
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