氯化稀土-环氧氯丙烷催化ε-己内酯开环聚合及其表征

Ring-opening polymerization of ε-caprolactone catalyzed by rare earth chlorides/epichlorohydrin

以无水氯化稀土/环氧氯丙烷为催化剂,催化ε-己内酯开环聚合,所得聚己内酯可通过大分子改性在分子链中引入离子液体,从而制备两亲性可降解生物材料。系统地探讨了不同稀土氯化物,环氧氯丙烷/稀土氯化物比值,聚合温度,时间及单体浓度等条件对聚合反应的影响。用FT-IR、GPC、1H-NMR和热分析等对聚合物结构和性能进行了表征,并对ε-己内酯开环聚合机理进行了分析。

Amphiphilic poly（ε-caprolaetone） was prepared by two steps. First, poly（ε-caprolactone） were synthesized by the binary catalytic system, anhydrous rare earth chloride/epichlorohydrin, then the resulted polymers were reacted with 1-methyl imidazolium to obtain the amphiphilic polymer. This new amphiphilic PCL was hopefully used as drug sustained-release matrix. Different conditions of the polymerization reaction, such as rare earth chlorides, ECH/LnCl3 molar ratio, temperature, time and monomer concentration were investigated. The polymers were characterized by FT-IR, 1H NMR, GPC, DTA and TG measures. And polymerization mechanism of CL was analyzed by 1H-NMR.