A morpholinium ionic liquid for cellulose dissolution
A morpholinium ionic liquid for cellulose dissolution
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DOI：
10.1016/j.carbpol.2015.04.032
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发表时间：
2015-10-05
影响因子：
11.2
通讯作者：
Mikkola, Jyri-Pekka
中科院分区：
文献类型：
--
作者：
Raut, Dilip G.;Sundman, Ola;Mikkola, Jyri-Pekka
合成了一系列取代吗啉离子盐和烯丙基乙酸铵。其中，发现N-烯丙基-N-甲基吗啉乙酸盐（[AMMorp][0Ac]）容易溶解纤维素，而无需对天然纤维素进行任何预处理。在120 ° C下，[AMMorp][OAc]可以在20分钟内溶解30重量%、28重量%和25重量%的聚合度（DPn）分别为789、1644和2082的纤维素。重要的是，SEC分析表明，再生后不同纤维素的聚合度没有明显变化。此外，当比较这些新合成的离子液体的纤维素溶解能力时，很明显，所有三种成分的组合-吗啉阳离子、烯丙基的存在和选择乙酸根阴离子对于有效的纤维素溶解是必不可少的。采用SEM、XRD、TGA、CP/MAS C-13 NMR和FTIR等方法对再生纤维素材料的结构和形貌进行了表征。(C)2015爱思唯尔有限公司版权所有。
A series of substituted morpholinium ionic salts and allyl ammonium acetates were prepared. Amongst those, N-allyl-N-methylmorpholinium acetate ([AMMorp][OAc]) was found to dissolve cellulose readily without any pre-processing of native cellulose. At 120 degrees C, [AMMorp][OAc] could dissolve 30 wt%, 28 wt% and 25 wt% of cellulose with degree of polymerization (DPn) - 789, 1644 and 2082 respectively, in 20 min. Importantly, SEC analysis indicated that no discernible changes occurred in terms of the degree of polymerization of the different celluloses after regeneration. Furthermore, when comparing the cellulose dissolution capability of these newly synthesized ionic liquids, it is evident that the combination of all three constituents - the morpholinium cation, the existence of an allyl group and choosing the acetate anion are essential for efficient cellulose dissolution. The structure and morphology of the regenerated cellulosic materials were characterized by SEM, XRD, TGA, CP/MAS C-13 NMR and FTIR, respectively. (C) 2015 Elsevier Ltd. All rights reserved.