Ionic liquid-mediated technology to produce cellulose nanocrystals directly from wood
Ionic liquid-mediated technology to produce cellulose nanocrystals directly from wood
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DOI：
10.1016/j.carbpol.2015.07.079
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发表时间：
2015-12-10
影响因子：
11.2
通讯作者：
Laborie, Marie-Pierre
中科院分区：
文献类型：
--
作者：
Abushammala, Hatem;Krossing, Ingo;Laborie, Marie-Pierre
本文首次报道了用1-乙基-3-甲基咪唑乙酸盐（[EMIM][OAc]）处理木材，直接提取纤维素纳米晶体（CNCs）。天然纤维素产物可以以相对于木材纤维素含量44%的产率回收。分析产物的形态（TEM、AFM、XRD）、化学（FTIR、C-13 CP/MAS NMR）、热（DSC、TGA）和表面性质（Zeta电位、接触角）。这些分析证明了天然纤维素I微结构的部分乙酰化（表面DS = 0.28）纳米晶体的存在，其结晶度指数为约75%，纵横比为65。从木材直接生产CNC归因于[EMIM][OAc]同时具有以下能力：（1）原位溶解木质素而仅溶胀纤维素，（2）通过乙酰化降低木材中的分子间内聚力，以及（3）催化纤维素水解。(C)2015爱思唯尔有限公司出版
We report for the first time the direct extraction of cellulose nanocrystals (CNCs) from wood by means of a 1-ethyl-3-methylimidazolium acetate ([EMIM][OAc]) treatment. A native cellulosic product could be recovered in 44% yield with respect to wood cellulose content. The product was analyzed for morphological (TEM, AFM, XRD), chemical (FTIR, C-13 CP/MAS NMR), thermal (DSC, TGA) and surface properties (Zeta potential, contact angle). These analyses evidenced the presence of partially acetylated (surface DS = 0.28) nanocrystals of native cellulose I microstructure, with a crystallinity index of about 75% and aspect ratio of 65. Direct production of CNCs from wood is ascribed to the simultaneous capability of [EMIM][OAc] to (1) dissolve lignin in situ while only swelling cellulose, (2) decrease intermolecular cohesion in wood via acetylation, and (3) to catalyze cellulose hydrolysis. (C) 2015 Published by Elsevier Ltd.