Abstract
Four wood pulps and a microcrystalline cellulose were dissolved in a NaOH 8%–water solution. Insoluble fractions and clear solution fractions were isolated by centrifugation and were observed by optical microscopy and transmission electron microscopy. Molecular weight distribution, carbohydrate composition and cellulose II content were measured. The dissolution of wood cellulose fibres in NaOH 8%–water solutions occurs by successive dismantlement and fragmentation steps governed by the swelling and the shearing of the original structure. The cellulose from insoluble and clear solution fractions is in both case converted in cellulose II and the insoluble fractions contain embedded mannans. Besides, the molecular weight distributions of cellulose from insoluble and clear solution fractions reveal the existence of heterogeneities in dissolution capacity of the cellulose chains, independent to the degree of polymerization, which are related to the chemical environment of the chains in the fibre structure.
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Acknowledgments
The authors thank J. Engelhardt, K. Jardeby, T. Hjerde, H. Harms, M. Pierre and C. Schrempf for discussions and Borregaard, Dow Wolff Cellulosics GmbH, Lenzing AG and Spontex for their technical and financial support. We also thank B Saake and J. Puls from the vTI-Institute of Wood Technology and Wood Biology for discussions and providing the kraft sample and the Institut of Molecular and Cellular pharmacology (IPMC) for their help in centrifugation.
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Nicolas Le Moigne and Patrick Navard are members of the European Polysaccharide Network of Excellence (EPNOE), www.epnoe.eu.
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Le Moigne, N., Navard, P. Dissolution mechanisms of wood cellulose fibres in NaOH–water. Cellulose 17, 31–45 (2010). https://doi.org/10.1007/s10570-009-9370-5
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DOI: https://doi.org/10.1007/s10570-009-9370-5