CP/MAS C-13 NMR study of pulp hornification using nanocrystalline cellulose as a model system

The hornification process of paper pulp was investigated using solid-state C-13 NMR spectroscopy. Nanocrystalline cellulose was used to serve as a model system of the crystalline parts of the fibrils in pulp fibers. Characterization of the nanocrystalline cellulose dimensions was carried out using s...

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Bibliographic Details
Published inCarbohydrate polymers Vol. 92; no. 1; p. 881
Main Authors Idström, Alexander, Brelid, H., Nydén, Magnus, Nordstierna, Lars
Format Journal Article
LanguageEnglish
Published 30.01.2013
Subjects
assignment
C-13 NMR
Cellulose
fibers
Fibril aggregation
Hornification
kraft pulp
mechanism
Nanocrystalline cellulose
Paper pulp
Solid-state NMR
spectroscopy
surface
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Summary:The hornification process of paper pulp was investigated using solid-state C-13 NMR spectroscopy. Nanocrystalline cellulose was used to serve as a model system of the crystalline parts of the fibrils in pulp fibers. Characterization of the nanocrystalline cellulose dimensions was carried out using scanning electron microscopy. The samples were treated by drying and wetting cycles prior to NMR analysis where the hornification phenomenon was recorded by spectral changes of the cellulose C-4 carbon signals. An increase of the crystalline signal and a decrease of the signals corresponding to the accessible amorphous domains were found for both paper pulp and nanocrystalline cellulose. These spectral changes grew stronger with repeating drying and wetting cycles. The results show that cellulose co-crystallization contribute to hornification. Another conclusion is that the surfaces of higher hydrophobicity in cellulose fibrils have an increased preference for aggregation.
ISSN:0144-8617
DOI:10.1016/j.carbpol.2012.09.097