CP/MAS C-13 NMR study of pulp hornification using nanocrystalline cellulose as a model system
Artikel i vetenskaplig tidskrift, 2013

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.

fibers

Paper pulp

mechanism

Hornification

assignment

Cellulose

C-13 NMR

surface

spectroscopy

kraft pulp

Solid-state NMR

Fibril aggregation

Nanocrystalline cellulose

Författare

Alexander Idström

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

SuMo Biomaterials

H. Brelid

Södra Innovation

Magnus Nydén

University of South Australia

Lars Nordstierna

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

Carbohydrate Polymers

0144-8617 (ISSN)

Vol. 92 881-884

Ämneskategorier

Pappers-, massa- och fiberteknik

DOI

10.1016/j.carbpol.2012.09.097