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离子液体中壳聚糖均相酰化改性

发表时间:2012-10-15  浏览量:1093  下载量:473
全部作者: 刘璐,周帅,王波,马明国,许凤,孙润仓
作者单位: 北京林业大学生物质化学与技术研究所,北京林业大学材料科学与技术学院;华南理工大学制浆造纸工程国家重点实验室
摘 要: 在离子液体溶解壳聚糖构成的均相反应体系中,研究壳聚糖的乙酰化反应,并探讨反应时间、温度和反应物配比对壳聚糖取代度(degree of substitution,DS)的影响。在质量分数为5%的壳聚糖/氯化1-甲基-3-烯丙基咪唑([Amim]Cl)体系中,当乙酰氯与壳聚糖单元物质的量之比为6∶1,60℃,反应12 h,壳聚糖的DS达到86.5%. [Amim]Cl离子液体经回收处理重复使用5次后,DS仍在77.0%以上,表明其具有良好的重复使用性。此方法后处理简单,反应条件温和,离子液体可重复使用,为改进传统的多相壳聚糖酰化反应提供了一个绿色途径。�
关 键 词: 林产化学加工学;天然高分子;壳聚糖;衍生化;均相酰化;离子液体
Title: Study on homogeneous acetylation moditication of chitosan in ionic liquids
Author: LIU Lu, ZHOU Shuai, WANG Bo, MA Mingguo, XU Feng, SUN Runcang
Organization: Institute of Biomass Chemistry and Technology, College of Materials Science and Technology, Beijing Forestry University; State Key Laboratory of Pulp and Paper Engineering, South China University of Technology
Abstract: The acetylation of chitosan was investigated in homogeneous chitosan/ionic liquid system, and the effect of reaction parameters, such as reaction time, temperature, and the molar ratio of acylated reagent to glucosamine unit on degree of substitution (DS) was studied. In 5% mass fraction chitosan /1-allyl-3-methylimidozalium chloride [Amim]Cl, 86.5% DS was obtained in the 6∶1 molar ratio of acetyl chloride to chitosan at 60℃ for 12 h. The chitosan DS just decreased slightly to 77% after [Amim]Cl was reused five times, demonstrating the good reusability of ionic liquids. This process combined the advantages of the excellent product separation methodology with nice DS result, which is expected to contribute to the development of green and environmentally friendly strategy for industrial chitosan derivatives.�
Key words: chemical processing of forest products; natural polymer; chitosan; derivatization; homogeneous acylation; ionic liquids
发表期数: 2012年10月第19期
引用格式: 刘璐,周帅,王波,等. 离子液体中壳聚糖均相酰化改性[J]. 中国科技论文在线精品论文,2012,5(19):1885-1891.
 
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