期刊
JOURNAL OF MOLECULAR STRUCTURE
卷 1048, 期 -, 页码 261-266出版社
ELSEVIER
DOI: 10.1016/j.molstruc.2013.05.060
关键词
Denoising; Wavelet analysis; Spectroscopic techniques; Polyethylene oxide
In the present paper the experimental findings obtained by different spectroscopic techniques on water mixtures of a protein model system, i.e. PolyEthylene Oxide (PEO), are reported. By increasing the polymerization degree m, the D-LAM spectral contribution shows a behavior of the centre frequency and of linewidth which tends to reach a constant value. Also the intramolecular OH stretching contribution, by increasing m, shows a shift which tends to flatten for polymers with molecular weight higher than M-w = 600. These results can be connected with the oligomer-polymer transition, at m = 13. When in aqueous solutions the D-LAM frequency increases towards the value corresponding to that of the crystal phase; similarly one observes also a sharpening of the D-LAM spectral contribution. These evidences suggest the presence of a more ordered conformation of PEO in water in respect to the melt phase. (c) 2013 Elsevier B.V. All rights reserved.
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