Superbase ionic liquids for effective cellulose processing from dissolution to carbonisation
Superbase ionic liquids for effective cellulose processing from dissolution to carbonisation
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DOI：
10.1039/c7gc02671d
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发表时间：
2017-12-21
期刊：
影响因子：
9.8
通讯作者：
Welton, Tom
中科院分区：
文献类型：
--
作者：
Kuzmina, Olga;Bhardwaj, Jyoti;Welton, Tom
合成并表征了一系列超碱衍生离子液体 (SIL)。它们溶解纤维素的能力和所生产的纤维的特性与其特定的结构和溶剂特性相关。对 17 种离子液体 (IL)（包括 9 种新型离子液体）进行了分析，并选择了 6 种离子液体来生产纤维：1-乙基-3-甲基咪唑鎓乙酸盐 [C(2)C(1)im][OAc]、1-乙基-3-甲基咪唑鎓二乙基磷酸盐 [C(2)C(1)im][DEP] 和 SIL 1-乙基-1,8-二氮杂双环[5.4.0]十一碳7-烯鎓二乙基磷酸酯[DBUEt][DEP]、1,8-二氮杂双环[5.4.0]十一碳烯鎓乙酸酯[DBUH][OAc]、1,5-二氮杂双环[4.3.0]非5-烯鎓乙酸酯[DBNH][OAc]和 1-乙基-1,5-二氮杂双环[4.3.0]非5-烯鎓二乙基磷酸酯[DBNEt][DEP]。研究了这些纤维的机械性能。然后将获得的纤维碳化以探索作为碳纤维前体的可能应用。使用 1,5-二氮杂双环[4.3.0]非 5-enium 基 SIL 与乙酸根和己酸根阴离子 (9:1) 的混合物 [DBNH][OAc][Hex] 获得的纤维显示出在可再生复合材料中的纺织品和纤维增强应用中具有良好的强度、刚度和失效应变应变组合。使用拉曼光谱表明，这些纤维表现出相对较高程度的结构有序性，并且比其他材料具有更少的缺陷。另一方面，与由 [C(2)C(1)im][OAc]、[C(2)C(1)im][DEP] 或 [DBNH][OAc][十六进制]。
A range of superbase derived ionic liquids (SILs) was synthesised and characterised. Their ability to dissolve cellulose and the characteristics of the produced fibres were correlated to their specific structural and solvent properties. 17 ionic liquids (ILs) (including 9 novel) were analysed and six ILs were selected to produce fibres: 1-ethyl-3-methylimidazolium acetate [C(2)C(1)im][OAc], 1-ethyl-3-methylimidazolium diethyl phosphate [C(2)C(1)im][DEP] and the SILs 1-ethyl-1,8-diazabicyclo[5.4.0] undec-7-enium diethylphosphate [DBUEt][DEP], 1,8-diazabicyclo[5.4.0] undec-7-enium acetate [DBUH][OAc], 1,5-diazabicyclo [4.3.0] non-5-enium acetate [DBNH][OAc] and 1-ethyl-1,5-diazabicyclo[4.3.0] non-5-enium diethylphsophate [DBNEt][DEP]. The mechanical properties of these fibres were investigated. The obtained fibres were then carbonised to explore possible application as carbon fibre precursors. The fibres obtained using a mixture of 1,5-diazabicyclo[4.3.0] non-5-enium based SILs with acetate and hexanoate anions (9 : 1), [DBNH][OAc][Hex], showed a promising combination of strength, stiffness and strain at failure values for applications in textiles and fibre reinforcement in renewable composites. Using Raman spectroscopy it is demonstrated that these fibres exhibit a relatively high degree of structural order, with fewer defects than the other materials. On the other hand, analogous fibres based on imidazolium cation with acetate and hexanoate anions (9 : 1), [C(2)C(1)im][OAc][Hex] showed a decline in the quality of the produced fibres compared to the fibres produced from [C(2)C(1)im][OAc], [C(2)C(1)im][DEP] or [DBNH][OAc][Hex].