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Título: Alkaline Pretreatment Facilitate Mechanical Fibrillation ofUnbleached Cellulose Pulps for Obtaining of Cellulose micro/nanofibrils (MFC)
Palavras-chave: Fibras de celulose
Microfibrilas de celulose
Nanofibrilas de celulose
Tratamento alcalino
Energia de fibrilação
Propriedades mecânicas
Suspensões de fibra
Cellulose fibers
Microfibrillated cellulose
Cellulose nanofibers
Alkaline treatment
Fibrillation energy
Mechanical properties
Fiber suspensions
Data do documento: 22-Jun-2022
Editor: Taylor & Francis Group
Citação: MENDONÇA, Maressa; DIAS, Matheus Cordazzo; MARTINS, Caio Cesar Nemer; DURÃES, Alisson Farley Soares; DAMÁSIO, Renato Augusto Pereira; TONOLI, Gustavo Henrique Denzin. Alkaline pretreatment facilitate mechanical fibrillation of unbleached cellulose pulps for obtaining of cellulose micro/nanofibrils (MFC). Journal of Natural Fibers, v. 19, n. 16, p. 13385-13400, 2022. DOI: 10.1080/15440478.2022.2092252. Disponível em: https://doi.org/10.1080/15440478.2022.2092252. Acesso em: 24 set. 2024.
Resumo: Energy expenditure is a limiting factor for the production of cellulose micro/nanofibrils in mechanical processing. This study evaluated the effect of novel alkaline pretreatments on unbleached Eucalyptus sp. pulps (hardwood) and Pinus sp. cellulose (softwood) to facilitate the production of cellulose nanofibrils by mechanical fibrillation and reduce the energy consumed by the mill. Pretreatments with NaOH in concentrations of 5% for 2 h and 10% for 1 h and 2 h and a hybrid pretreatment with 5%/16% NaOH/ H2O2 for 2 h were evaluated. The 10% pre-treatment was done at 1 h and 2 h to evaluate the effect of the less aggressive treatment (1 h). The morphology, chemical composition, turbidity of the fibers/suspensions, mechanical properties, fibrillation quality index and energy expended during the fibrillation were evaluated for each pretreatment. The less aggressive pretreatments produced micro/nanofibrils with fewer passes of the pulp through the fibrillator, which effectively facilitated extraction with lower energy consumption. The hybrid pretreatment did not show satisfactory results in reducing energy consumption, and the quality of the nanofibrils produced by this pre-treatment was inferior to the others. This study showed innovation in performing novel and efficient NaOH and hybrid (NaOH/H202) pretreatments on commercial unbleached pulps to obtain pulp micro/nanofibrils.
Descrição: As licenças de acesso aberto aplicáveis a este artigo estão em conformidade com as políticas do periódico em que foi publicado, disponíveis no link: https://v2.sherpa.ac.uk/id/publication/5687. Consulta realizada em 24 de set. de 2024.
URI: https://doi.org/10.1080/15440478.2022.2092252
http://repositorio.ufla.br/jspui/handle/1/59489
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