Abstract:

The homogeneous graft copolymerization of L-lactide(L-LA) onto chitosan (CS) using ionic liquid 1-butyl-3-methylimidazolium chloride (［BMIM］Cl) as reaction medium was studied. The effects of various reaction parameters on grafting percentage, such as monomer content, catalyst concentration, reaction time and reaction temperature were investigated. The obtained chitosan grafted poly(L-lactide) (CL) was characterized with FTIR,¹H NMR and TG. The results showed that the reaction efficiency of homogeneous graft copolymerization of L-LA and CS in ionic liquid was higher than that of non-homogeneous graft copolymerization.

摘要：

以离子液体1-丁基-3-甲基咪唑氯盐（［BMIM］Cl）为反应介质，壳聚糖（CS）与L-丙交酯(L-LA)发生均相接枝共聚反应，得到了壳聚糖与L-丙交酯的接枝共聚物。考察了单体和催化剂的用量、反应的温度和时间对接枝率的影响规律。并利用红外光谱、核磁共振氢谱、热重分析等对接枝共聚物进行了表征，证实了L-丙交酯在壳聚糖分子链上发生了接枝共聚。实验结果表明，在［BMIM］Cl中进行的L-丙交酯与壳聚糖的均相接枝共聚反应效率高于非均相反应。