Effect of methylimidazole on cellulose/ionic liquid solutions and regenerated material therefrom
Effect of methylimidazole on cellulose/ionic liquid solutions and regenerated material therefrom
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DOI：
10.1007/s10853-014-8052-3
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发表时间：
2014-01
影响因子：
4.5
通讯作者：
C. Olsson;Artur Hedlund;Alexander Idström;G. Westman
中科院分区：
文献类型：
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作者：
C. Olsson;Artur Hedlund;Alexander Idström;G. Westman
纤维素，特别是木质纤维素，对于制造人造再生纤维等日常材料越来越重要，这些材料是通过溶解和随后的沉淀生产的。本文讨论了助溶剂在离子液体促进纤维素溶解中的作用。对微晶纤维素浆和溶解级阔叶木浆进行了研究。通过浊度测量和粘度测定，评价了三种不同的助溶剂与离子液体的复配效果。离子液体前体N-甲基咪唑被证明是一种很有前途的助溶剂候选者，因此被选为与离子液体1-乙基-3-甲基咪唑乙酸酯一起进行进一步研究的对象。结果表明，加入助溶剂可提高溶出度，并能显著降低粘度。溶液在室温下稳定，可通过气隙纺丝和传统湿法纺丝制得力学性能良好的再生纤维。用二元溶剂纺制的纤维结晶度明显高于纯离子液体纺丝的纤维。
Cellulose, especially wood-based cellulose, is increasingly important for making everyday materials such as man-made-regenerated textile fibers, produced via dissolution and subsequent precipitation. In this paper, the effect of cosolvents in ionic liquid-facilitated cellulose dissolution is discussed. Both microcrystalline cellulose and dissolving grade hardwood pulp were studied. Three different cosolvents in combination with ionic liquid were evaluated using turbidity measurements and viscosity. The ionic liquid precursor N-methylimidazole proved to be a promising cosolvent candidate and was thus selected for further studies together with the ionic liquid 1-ethyl-3-methylimidazolium acetate. Results show that dissolution rate can be increased by cosolvent addition, and the viscosity can be significantly reduced. The solutions were stable over time at room temperature and could be converted to regenerated textile fibers with good mechanical properties via airgap spinning and traditional wet spinning. Fibers spun from binary solvents exhibited significantly higher crystallinity than the fibers from neat ionic liquid.