Non-equilibrium behavior of polyethylene glycol (PEG)/polypropylene glycol (PPG) mixture studied by Fourier transform infrared (FTIR) spectroscopy

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• 作者：Hideyuki Shinzawa^a ; ^b ; ^{h-shinzawa@aist.go.jp} ; Tadafumi Uchimaru^a ; Junji Mizukado^a ; Sergei G. Kazarian^b ; ^{s.kazarian@imperial.ac.uk}
• 关键词：Fourier transform infrared (FTIR) spectroscopy ; Two-dimensional (2D) correlation spectroscopy ; Polyethylene glycol (PEG) ; Polypropylene glycol (PPG)
• 刊名：Vibrational Spectroscopy
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：88
• 期：Complete
• 页码：49-55
• 全文大小：1460 K
• 卷排序：88

文摘

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.