Application of dynamic 2D FTIR to cellulose |
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| Institution: | 1. Institute of Chemistry, University of Agricultural Sciences, Muthgasse 18, A-1190 Vienna, Austria;2. Swedish Pulp and Paper Research Institute (STFI), Box 5604, S-11486 Stockholm, Sweden;1. School of Renewable Natural Resources, Louisiana State University AgCenter, Baton Rouge, LA 70803, USA;2. Key Biomass Energy Laboratory of Henan Province, Zhengzhou 450008, Henan, China;3. Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA 70803, USA;4. School of Nutrition and Food Science, Louisiana State University AgCenter, Baton Rouge, LA 70803, USA;1. International Research Centre, Kalasalingam University, Krishnankoil 626126 Tamil Nadu, India;2. Department of Nanoscience and Nanotechnology, Karunya University, Tamil Nadu, India;3. Osun State University, Osogbo, Nigeria;4. School of Bioprocess Engineering, Universiti Malaysia, 02600 Arau, Perlis, Malaysia;5. Institute of Nano Electronic Engineering, Universiti Malaysia, 01000 Kangar, Perlis, Malaysia;6. Department of Zoology University of Madras, Guindy Campus, Chennai 600 025, Tamil Nadu, India;1. University of Sopron, Institute of Wood Based Products and Technologies, 9400 Sopron, Hungary;2. Obuda University, Donat Banki Faculty of Mechanical and Safety Engineering, 1081 Budapest, Hungary;3. Vin?a Institute of Nuclear Sciences, University of Belgrade, P.O. Box 522, 11001 Belgrade, Serbia |
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| Abstract: | Cellulose, the dominant polymer in the biosphere, is a homopolysaccharide composed of (1,4)-β-d-glucopyranose. Interactions between and within the cellulose polymer chains are mainly determined by inter- and intramolecular hydrogen bonds, which are therefore mainly responsible for mechanical properties of cellulosic materials. The coupling of dynamic mechanical analysis (DMA) and 2D step-scan Fourier transform infrared (FTIR) spectroscopy, is shown to be a very promising way of investigating these submolecular interactions in cellulosic materials. The broad and unstructured band in the OH-stretching vibration region (3100 and 3700 cm?1) of the cellulose vibrational spectra, which contains information about the intra- and intermolecular hydrogen bonds, can be unraveled by this new technique. In the experiments reported here, cellulose sheets have been stretched sinusoidally at low strains while being irradiated with polarized infrared light. For the obtained dynamic IR signals (the in-phase and the out-of-phase responses of the sample), the dynamic IR cross-correlation was defined. It consists of two terms which are referred to as the synchronous and the asynchronous 2D infrared correlation intensities. In the 2D spectra, obtained by DMA–FTIR, several distinct peaks are observed in the OH-range between 3700 and 3100 cm?1 which may be related to specific interactions. |
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