[Wiley数据库][2012] Homogeneous synthesis and characterization of starch acetates in ionic liquid witho--中科院兰州化物所离子液体

[Wiley数据库][2012] Homogeneous synthesis and characterization of starch acetates in ionic liquid witho

发布时间:2016-03-22 21:41:58 阅读次数:

题名	[Wiley数据库][2012] Homogeneous synthesis and characterization of starch acetates in ionic liquid without catalysts
参考引用方式	Zhigang Luo, Zidan Zhou. Starch/Starke 2012, 64, 37–44
研究机构	华南理工大学
所涉及离子液体	1-丁基-3-甲基咪唑氯盐 79917-90-1
研究领域	淀粉醋酸酯；均相合成；特性研究；离子液体
论文摘要	Homogeneous modification of corn starch with acetic anhydride was performed in ionic liquids 1-butyl-3-methylimidazolium chloride (BMIMCl) without catalysts. The results indicated that the pretreatment of starch, which starch was dissolved in BMIMCl at 1058C for 2 h before reaction, provided feasible reaction environment for starch functionalization. Optimum modification conditions for maximum degree of substitute (DS 2.11) were shown as following: acetic anhydride/anhydroglucose units (AGU) molar ratio 5:1, reaction temperature 1058C and reaction time 2 h. The pretence of acetyl groups in starch products was confirmed by FTIR and 1H NMR spectroscopy. SEM and XRD data showed that the crystalline structure of native starch was disrupted and new structure was formed during the dissolution and modification processes. The higher DS due to acetylation had a beneficial effect on the thermal stability of samples.
关键词	Acetic anhydride / Catalyst / Homogeneous / Ionic liquid / Starch