Morphology and rheology of cellulose nanofibrils derived from mixtures of pulp fibres and papermaking fines
| Autor: | Melanie Mayr, Wolfgang Bauer, Wolfgang Johann Fischer, Jérôme Colson, Wolfgang Gindl-Altmutter |
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| Jazyk: | angličtina |
| Předmět: |
Materials science
Polymers and Plastics Fines 02 engineering and technology Pulp engineering.material Fibre length 010402 general chemistry 01 natural sciences chemistry.chemical_compound Rheology Homogenisation Cellulose Composite material Reduced viscosity Atomic force microscopy Papermaking Pulp (paper) 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry engineering Cellulose nanofibrils Nanometre 0210 nano-technology |
| Zdroj: | Cellulose. 23(4):2439-2448 |
| ISSN: | 0969-0239 |
| DOI: | 10.1007/s10570-016-0987-x |
| Popis: | The rheological behaviour of homogenised fibres originally having different lengths was evaluated. For this purpose, mixtures of pulp fibres and fines were fibrillated mechanically without pre-treatment and characterised with regard to morphology and viscosity. It was found that, for all samples, a similar number of homogenisation passes was needed to reach a viscosity plateau. However, the value of the final viscosity differed significantly: homogenised suspensions derived from fines achieved only about 60 % of the viscosity of suspensions derived from pulp. Already after a few homogenisation cycles, no differences between the samples could be measured using optical devices, indicating that fibrillation on the nanometre scale was responsible for the distinct rheological behaviours. Atomic force microscopy measurements indicated significantly reduced fibril lengths for the suspensions derived from fines, which explains their reduced viscosity. |
| Databáze: | OpenAIRE |
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