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metadata.artigo.dc.title: Influence of hemicellulose content of Eucalyptus and Pinus fibers on the grinding process for obtaining cellulose micro/nanofibrils
metadata.artigo.dc.creator: Dias, Matheus Cordazzo
Mendonça, Maressa Carvalho
Damásio, Renato Ausgusto Pereira
Zidanes, Uasmim Lira
Mori, Fábio Akira
Ferreira, Saulo Rocha
Tonoli, Gustavo Henrique Denzin
metadata.artigo.dc.subject: Cell wall
Cellulose nanofibers
Energy consumption
Microfibrillated cellulose (MFC)
metadata.artigo.dc.publisher: De Gruyter 2019
metadata.artigo.dc.identifier.citation: DIAS, M. C. et al. Influence of hemicellulose content of Eucalyptus and Pinus fibers on the grinding process for obtaining cellulose micro/nanofibrils. Holzforschung, [S.l.], v. 73, n. 11. 2019.
metadata.artigo.dc.description.abstract: he 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.
metadata.artigo.dc.language: en_US
Appears in Collections:DCF - Artigos publicados em periódicos
DEG - Artigos publicados em periódicos

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