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Influence of water on localized and delocalized molecular mobility of cellulose

Jafarpour, Golnaz and Roig, Frédéric and Dantras, Eric and Boudet, Alain-Michel and Lacabanne, Colette Influence of water on localized and delocalized molecular mobility of cellulose. (2007) Journal of Non-Crystalline Solids, vol. 3 (n° 44-). 4108-4115 . ISSN 0022-3093

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Official URL: http://dx.doi.org/10.1016/j.jnoncrysol.2009.06.026

Abstract

The influence of hydration on cellulose molecular mobility is investigated by two dielectric methods at different molecular scale. The mobility of side groups, assigned to c mode, for dried cellulose increases. The water molecules have an anti-plasticizer effect on c mode due to the water–polymer hydrogen bonding. For the b relaxation mode, only observed by the Thermo Stimulated Current technique, the hydration plays a role of plasticizer. The a relaxation mode assigned to the delocalized cooperative mobility of long chain segments of cellulose is plasticized by water. The study of activated parameters deduced from fractional polarization procedure, shows an increase of the activation enthalpy range with dehydration. It permits to conclude that reduction of hydrogen bonds density leading to a more extended cooperative mobility.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Journal of Non-Crystalline Solidswebsite : http://www.sciencedirect.com/science/journal/00223093
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By:Nihad Lahdifi

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