Acetone-soluble cellulose acetates prepared by one-step homogeneous acetylation of cornhusk cellulose in an ionic liquid 1-allyl-3-methylimidazolium chloride (AmimCl)
Acetone-soluble cellulose acetates prepared by one-step homogeneous acetylation of cornhusk cellulose in an ionic liquid 1-allyl-3-methylimidazolium chloride (AmimCl)
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DOI：
10.1016/j.carbpol.2007.02.001
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发表时间：
2007-07-02
影响因子：
11.2
通讯作者：
Zhang, Yi
中科院分区：
文献类型：
--
作者：
Cao, Yan;Wu, Jin;Zhang, Yi
从玉米皮中提取的纤维素样品已成功地在离子液体1-烯丙基-3-甲基咪唑氯化物（AmimCl）中乙酰化。在不使用任何催化剂的情况下，一步法制备取代度（DS）在2.16至2.63范围内的玉米皮纤维素乙酸酯（CCA）。在均相状态下，CCA的DS值很容易通过乙酰化时间来控制。采用FT-IR、13 C NMR、DSC、TGA和力学性能测试等手段对所制得的CCAs进行了表征。NMR结果表明，在脱水葡萄糖单元的三个OH基团之间的乙酰基部分的分布显示出在C-6位的偏好。CCAs在丙酮、DMSO等有机溶剂中具有良好的溶解性。用丙酮溶液浇铸的CCA膜具有良好的力学性能。在玉米皮纤维素的每次乙酰化反应结束时，离子液体AmimCl可以有效地回收。因此，本研究为农作物副产品的综合利用提供了一条有前途的途径和“绿色工艺”。(c)2007爱思唯尔有限公司保留所有权利。
Cellulose samples extracted from cornhusk have been successfully acetylated in an ionic liquid 1-allyl-3-methylimidazolium chloride (AmimCl). Without using any catalyst, cornhusk cellulose acetates (CCAs) with the degree of substitution (DS) in a range from 2.16 to 2.63 were prepared in one-step. Under the homogeneous state, the DS value of CCAs was easily controlled by the acetylation time. The obtained CCAs were characterized by means of FT-IR, C-13 NMR, DSC, TGA, and a mechanical test. The NMR results showed that the distribution of the acetyl moiety among the three OH groups of the anhydroglucose unit shows a preference at the C-6 position. The CCAs exhibited good solubility in some organic solvents, such as acetone and DMSO. The cast CCA films from their acetone solutions had good mechanical properties. At the end of each acetylation of cornhusk cellulose, the ionic liquid AmimCl could be effectively recovered. Therefore, this study presents a promising approach and "green process" to make use of crop by-products. (c) 2007 Elsevier Ltd. All rights reserved.