筛选出对壳聚糖溶解具有良好性能的磺酸型离子液体[MIMBS] HSO4,以该离子液体水溶液为反应介质,在均相体系中进行了壳聚糖的氧化降解反应.考察了离子液体用量、H2O2与壳聚糖单元摩尔比、反应温度和反应时间对该氧化降解反应的影响.利用黏度法测定壳聚糖的相对分子质量,采用X射线衍射和红外光谱对原料和再生壳聚糖的结构进行表征.X射线衍射分析结果表明,溶解过程中壳聚糖的晶体结构遭到破坏,结晶度下降.随着离子液体溶液浓度的增加、H2O2用量的增大、反应温度的升高以及反应时间的延长,氧化降解反应进行得更加彻底.在最佳反应条件(8％离子液体水溶液、底物摩尔比5、反应温度80℃、反应时间3h)下,再生壳聚糖的收率为74％,其黏均相对分子质量为21.2×103.
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