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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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