Improvement of the properties of nanocellulose suspensions and films by the presence of residual lignin

IF 4.9 2区 工程技术 Q1 MATERIALS SCIENCE, PAPER & WOOD
Ricardo O. Almeida, Ana Ramos, Erfan Kimiaei, Monika Österberg, Thaddeus C. Maloney, José A. F. Gamelas
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引用次数: 0

Abstract

The effect of lignin on several properties of nanocellulose suspensions and films, such as degree of mechanical fibrillation, optical transparency, and gas barrier properties is still a matter of study. In the present work, it was investigated the influence of residual lignin on the efficiency of cationization and enzymatic pretreatments to produce lignin-containing nanocelluloses (LCNFs) from unbleached kraft pulps, and, on the properties (mechanical, gas barrier, transparency, antioxidant activity and thermal stability) of the corresponding films. The overall efficiency of the pretreatments was not negatively affected by the presence of lignin (3–4 wt%) in the starting pulps, as measured by the degree of fibrillation, degree of polymerization of cellulose, optical transmittance, and cationic group content (cationization). On the contrary, lignin could even enhance the mechanical fibrillation and the optical transmittance (transparency) of the cationic and enzymatic LCNF suspensions compared to the reference lignin-free nanocelluloses (CNFs) prepared from bleached pulp. Lignin could also improve the optical transparency of the films, which is an important finding of the present work: 64.8% for LCNF-Cationic (-Cat) vs. 56.9% for CNF-Cat, and 74.5% for LCNF-Enzymatic (-Enz) vs. 64.5% for CNF-Enz. Moreover, films with lignin demonstrated higher antioxidant activity, UV-light absorption capacity, larger char residue, and even improved oxygen barrier compared to the analogous CNF films. A remarkable oxygen barrier performance was exhibited by the LCNF-Enz film (oxygen transmission rate below 2 cm3/m2.day). Overall, the presence of residual lignin in the cellulose micro/nanofibril production can improve some of the suspension and film properties, particularly the optical transparency.

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来源期刊
Cellulose
Cellulose 工程技术-材料科学:纺织
CiteScore
10.10
自引率
10.50%
发文量
580
审稿时长
3-8 weeks
期刊介绍: Cellulose is an international journal devoted to the dissemination of research and scientific and technological progress in the field of cellulose and related naturally occurring polymers. The journal is concerned with the pure and applied science of cellulose and related materials, and also with the development of relevant new technologies. This includes the chemistry, biochemistry, physics and materials science of cellulose and its sources, including wood and other biomass resources, and their derivatives. Coverage extends to the conversion of these polymers and resources into manufactured goods, such as pulp, paper, textiles, and manufactured as well natural fibers, and to the chemistry of materials used in their processing. Cellulose publishes review articles, research papers, and technical notes.
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