Journal
CARBOHYDRATE POLYMERS
Volume 74, Issue 3, Pages 509-513Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2008.04.005
Keywords
cellulose; cellulose acetate; hydrogen bond; two-dimensional infrared spectroscopy; moving-window
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Funding
- National Science of Foundation of China (NSF) [20774022, 20573022, 20425415, 20490220]
- Leading Scientist Project of Shanghai [07XD14002]
- National Basic Research Program of China [2005CB623800)]
- MOE [20050246010]
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Temperature-dependent structural changes in hydrogen bonds in cellulose diacetate (CDA) were investigated by Fourier transform infrared spectroscopy (FT-IR). The O-H stretching vibration band was selected to explore the structure changes. Two-dimensional correlation spectroscopy (2DCOS) in combination with moving-window technique was applied to analyze the overlapping O-H band due to various kinds of hydrogen bonds. By virtue of this powerful method, the inter-chain and intra-chain hydrogen bonds in cellulose diacetate can be identified. Moreover, typical temperature with great spectral variation was visualized by the moving-window analysis. In the temperature region of 35-100 degrees C, the absorbed water in the hydrogen-bond matrix broke away, and the structure of hydrogen bonds in CDA changed accordingly. When temperature increased into a higher region, both the inter-chain hydrogen bonds (comparatively strong but relatively unstable) and the intra-chain hydrogen bonds (comparatively weak but stable) began to decrease, and the inter-chain hydrogen bonds were weakened prior to the intra-chain hydrogen bonds. (C) 2008 Elsevier Ltd. All rights reserved.
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