Cellulose nanocrystals prepared via formic acid hydrolysis followed by TEMPO-mediated oxidation
Cellulose nanocrystals prepared via formic acid hydrolysis followed by TEMPO-mediated oxidation
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DOI：
10.1016/j.carbpol.2015.07.033
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发表时间：
2015-11-20
影响因子：
11.2
通讯作者：
Xu, Chunlin
中科院分区：
文献类型：
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作者：
Li, Bin;Xu, Wenyang;Xu, Chunlin
纤维素纳米晶体作为一种可再生、可生物降解的纳米材料，具有广泛的应用价值。在这项工作中，CNCs从漂白化学纸浆中提取使用两个阶段的分离（即甲酸（FA）水解和2，2，6，6-四甲基哌啶-1-氧基（克里思）介导的氧化）在温和的条件下。在第一阶段，FA用于去除半纤维素，溶胀纤维素纤维，并释放CNCs。FA可以很容易地回收和重复使用。在第二阶段中，通过FA分离的CNCs进一步通过TEMPO介导的氧化修饰，以增加CNCs的表面电荷。结果表明，具有更有序的晶体结构和更高表面电荷的改性CNCs在水相中具有更好的溶解性和更高的粘度。因此，在水性涂料、油漆、食品等领域中作为流变改性剂使用时，改性后的CNCs可能会更有效。（C）2015 Elsevier Ltd.保留所有权利。
Cellulose nanocrystals (CNCs) as a renewable and biodegradable nanomaterial have wide application value. In this work, CNCs were extracted from bleached chemical pulp using two stages of isolation (i.e. formic acid (FA) hydrolysis and 2,2,6,6-tetramethyl-piperidine-1-oxyl (TEMPO) mediated oxidation) under mild conditions. In the first stage, FA was used to remove hemicellulose, swell cellulose fibers, and release CNCs. The FA could be readily recovered and reused. In the second stage, the CNCs isolated by FA were further modified by TEMPO-mediated oxidation to increase the surface charge of CNCs. It was found that the modified CNCs with more ordered crystal structure and higher surface charge had better redispersibility and higher viscosity in aqueous phase. Therefore, the modified CNCs could be more effective when used as rheology modifier in the fields of water based coating, paint, food etc. (C) 2015 Elsevier Ltd. All rights reserved.