Synthesis of starch esters in ionic liquids
Synthesis of starch esters in ionic liquids
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DOI：
10.1002/app.31327
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发表时间：
2010-04
影响因子：
3
通讯作者：
Wenlei Xie;Li Shao;Yawei Liu
中科院分区：
文献类型：
--
作者：
Wenlei Xie;Li Shao;Yawei Liu
以1-丁基-3-甲基咪唑氯（BMIMCl）为反应介质，用丁二酸酐或乙酸酐对玉米淀粉进行了化学改性。根据淀粉衍生物的取代度（DS）跟踪反应过程。结果表明，在100℃条件下，以酸酐/无水葡萄糖的5∶1摩尔比进行淀粉均相酯化反应，得到DS值为0.37 ~ 2.35的乙酸酯和DS值为0.03 ~ 0.93的琥珀酸酯。此外，所使用的反应介质易于回收再利用。此外，在FTIR和NMR光谱中羰基信号的存在证实了淀粉酯的形成。结果表明，在一定的反应条件下，淀粉颗粒在离子液体体系中大部分由晶体结构转化为非晶态。©2009 Wiley期刊公司高分子学报，2010
Chemical modification of corn starches with succinic anhydride or acetic anhydride was carried out using 1-butyl-3-methylimidazolium chloride (BMIMCl) as a reaction medium. The reaction progress was followed in terms of the degree of substitution (DS) for the starch derivatives. The results showed that the homogeneous esterification of starch at 5 : 1 molar ratio of anhydride/anhydroglucose units at 100°C led to formation of acetates with DS ranging from 0.37 to 2.35 and succinates with DS ranging from 0.03 to 0.93. Moreover, the reaction media applied could be easily recycled and reused. Further, the formation of starch esters was confirmed by the presence of the carbonyl signal in the FTIR and NMR spectra. It was shown that the starch granules were mostly converted from their crystalline structure into amorphous state in the ionic liquid system under the given reaction conditions. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010