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- Title
Influence of hemicellulose content of Eucalyptus and Pinus fibers on the grinding process for obtaining cellulose micro/nanofibrils.
- Authors
Dias, Matheus Cordazzo; Mendonça, Maressa Carvalho; Damásio, Renato A.P.; Zidanes, Uasmim Lira; Mori, Fábio Akira; Ferreira, Saulo Rocha; Tonoli, Gustavo H.D.
- Abstract
The objective of this study was to verify the effect of the hemicellulose content of commercial bleached pulps on the ease of mechanical fibrillation and on its energy consumption (EC). NaOH in concentrations of 5% with 2 h of reaction, and 10% with 1 and 2 h of reaction, was evaluated for the partial removal of hemicelluloses. Pulp fibrillation was influenced by hemicellulose removal, being less fibrillated when excessive removal occurred (in the range of 4–8.5%). Hemicellulose content in the range of 9–13% increased the water retention value (WRV) and led to nanofibrils with smaller diameter, while a stronger alkali concentration reduced the WRV. X-ray diffraction (XRD) showed that reaction time was a determining factor for the crystallinity of the samples and partial conversion of cellulose I to cellulose II in pretreatments with NaOH 10% (1 and 2 h), and was a factor that may also damage the fibrillation process. Pre-treatment with NaOH 5% for 2 h promoted energy savings for both pulps. This work demonstrated that hemicellulose content has a considerable influence on the mechanical fibrillation and is a key aspect of the balance between efficient fibrillation and the energy required for that.
- Subjects
CELLULOSE; HEMICELLULOSE; PINE; PINACEAE; MECHANICAL energy; EUCALYPTUS
- Publication
Holzforschung: International Journal of the Biology, Chemistry, Physics, & Technology of Wood, 2019, Vol 73, Issue 10, p1035
- ISSN
0018-3830
- Publication type
Article
- DOI
10.1515/hf-2018-0230