Use este identificador para citar ou linkar para este item: http://repositorio.ufla.br/jspui/handle/1/50724
Título: Influence of hemicellulose content and cellulose crystal change on cellulose nanofibers properties
Palavras-chave: Cellulose nanofibers
Cellulose polymorphs
Nanocellulose
Polyose
Shear rheology
Nanofibras de celulose
Polimorfos de celulose
Nanocelulose
Poliose
Reologia
Cisalhamento
Data do documento: Jul-2022
Editor: Elsevier
Citação: DIAS, M. C. et al. Influence of hemicellulose content and cellulose crystal change on cellulose nanofibers properties. International Journal of Biological Macromolecules, [S.I.], v. 213, p. 780-790, July 2022. DOI: https://doi.org/10.1016/j.ijbiomac.2022.06.012.
Resumo: This study aimed to evaluate the properties of cellulose nanofibers (CNFs) with different hemicellulose contents and cellulose II polymorphs. A link was found between these polysaccharides and the properties of CNFs. A decrease in crystallinity (from 69 to 63%) and changes in the crystalline structure of cellulose subjected to an alkaline environment were observed, promoting the partial conversion of cellulose I to cellulose II (from 2 to 42%) and preventing CNFs production at NaOH concentrations higher than 5%. Most treatments showed pseudoplastic fluid behavior, except for the 10% NaOH treatment over 2 h, which showed Newtonian fluid behavior. The quality index of the reference CNFs (TEMPO-oxidized) was the highest (80 ± 3), followed by that of the 5% NaOH-treated (68 ± 3 and 22% energy savings compared to the untreated sample), and the untreated (63 ± 3) samples; and the 10% NaOH treatments had quality indices of 51 ± 3 and 32 ± 1, respectively.
URI: https://doi.org/10.1016/j.ijbiomac.2022.06.012
http://repositorio.ufla.br/jspui/handle/1/50724
Aparece nas coleções:DCA - Artigos publicados em periódicos

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