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Study of LCNF and CNF from pine and eucalyptus pulps
Nordic Pulp & Paper Research Journal ( IF 1.2 ) Pub Date : 2020-11-18 , DOI: 10.1515/npprj-2019-0075
Iara Fontes Demuner 1 , Jorge Luiz Colodette 1 , Fernando José Borges Gomes 2 , Rubens Chaves de Oliveira 1
Affiliation  

Abstract Nanocelluloses produced from wood pulp are widely studied for various economic applications. Most studies of cellulose nanofibrils (CNF) use lignin-free fibres obtained from bleached pulps; however, unbleached fibres with residual lignin may also be used to obtain lignocelluloses nanofibrils (LCNF). Research on lignocellulose nanofibrils is a recent subject in the field; thus, the aim of the present study was to determine the ultrastructure of lignocellulose nanofibrils compared to cellulose nanofibrils produced from the same raw material. Understanding of nanoparticle properties is of great relevance for their various applications; therefore, complete characterisation of the chemical, physical, and morphological structures of LCNF and CNF produced from pine and eucalyptus woods was performed. Unbleached cellulosic fibres are a viable alternative for LCNF production, which has properties comparable to that of traditional CNF production that uses lignin-free fibres. LCNF from pine and eucalyptus were obtained with 4.0 % and 1.8 % residual lignin, respectively. The nanofibrils had high thermal stability because LCNF had a higher maximum degradation temperature. Due to the low interaction of lignin with water, LCNF had a lower water retention value than CNF.

中文翻译:

松树和桉树浆中LCNF和CNF的研究

摘要 由木浆生产的纳米纤维素被广泛研究用于各种经济应用。大多数关于纤维素纳米原纤维 (CNF) 的研究使用从漂白纸浆中获得的不含木质素的纤维;然而,带有残留木质素的未漂白纤维也可用于获得木质纤维素纳米原纤维 (LCNF)。木质纤维素纳米原纤维的研究是该领域的最新课题;因此,本研究的目的是确定木质纤维素纳米纤丝与由相同原材料生产的纤维素纳米纤丝相比的超微结构。了解纳米粒子的特性与其各种应用密切相关;因此,对松树和桉木产生的 LCNF 和 CNF 的化学、物理和形态结构进行了完整的表征。未漂白的纤维素纤维是 LCNF 生产的可行替代品,其特性可与使用无木质素纤维的传统 CNF 生产相媲美。来自松树和桉树的 LCNF 分别具有 4.0% 和 1.8% 的残留木质素。纳米原纤维具有高热稳定性,因为 LCNF 具有更高的最大降解温度。由于木质素与水的低相互作用,LCNF 的保水值低于 CNF。
更新日期:2020-11-18
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