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Published in: Cellulose 3/2019

03-12-2018 | Original Research

Influence of cellulose chemical pretreatment on energy consumption and viscosity of produced cellulose nanofibers (CNF) and mechanical properties of nanopaper

Authors: L. C. Malucelli, M. Matos, C. Jordão, D. Lomonaco, L. G. Lacerda, M. A. S. Carvalho Filho, W. L. E. Magalhães

Published in: Cellulose | Issue 3/2019

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Abstract

Lignocellulosic fibers are the main sources for producing nanocellulose, in which mechanical methods are the most appropriate to achieve a high yield and generate low residue. High energy consumption is the major drawback in these processes, although they are the cheapest way to produce nanocellulose. Chemical pretreatment is one approach to further decrease the overall cost during defibrillation; however, the influence over sample viscosity and mechanical properties is yet to be investigated. Here, we study the influence of chemical pretreatments using NaOH and 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) on the mechanical, rheological and structural properties of cellulose nanofibers made from bleached eucalyptus pulp. Modification of samples was evidenced by their respective peaks on FTIR spectra. Sample crystallinity increased after partial hemicellulose and amorphous cellulose removal. In addition, a strong correlation between grinding efficiency and lower energy consumption was observed. However, a mild alkaline treatment may improve fiber strength at the expense of suspension stability and energy consumption. Modified nanofibers presented good potential for enhancing mechanical properties and/or improving suspension stability.

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Metadata
Title
Influence of cellulose chemical pretreatment on energy consumption and viscosity of produced cellulose nanofibers (CNF) and mechanical properties of nanopaper
Authors
L. C. Malucelli
M. Matos
C. Jordão
D. Lomonaco
L. G. Lacerda
M. A. S. Carvalho Filho
W. L. E. Magalhães
Publication date
03-12-2018
Publisher
Springer Netherlands
Published in
Cellulose / Issue 3/2019
Print ISSN: 0969-0239
Electronic ISSN: 1572-882X
DOI
https://doi.org/10.1007/s10570-018-2161-0

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