Structure and conformation in mixtures of methyl-terminated poly(ethylene oxide) and water. Principal component analysis and band fitting of infrared absorptions.
作者： Jacob J. Shephard , Phil J. Bremer , A. James McQuillan
DOI: 10.1021/JP905149Z
关键词:
摘要: Infrared absorption spectra of aqueous mixtures poly(ethylene oxide) dimethyl ether (PEO), with a number average molecular weight 500 and water volume fraction between 0 0.96 have been recorded at 18, 26, 40 °C. Composition temperature were found to influence the intensity wavenumber PEO-related absorptions. Spectral band fitting CH2 wagging/twisting region showed that proportion gauche trans conformers C−C C−O bonds varied composition. Principal component analysis (PCA) absorptions configuration conformation about bond was favored all compositions temperatures tested but decreasingly as increased. PCA also enabled assignment spectral features associated specific either or bond. Water-related O−H stretching indicated hydrogen w...
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