通过RAFT法制备双亲性嵌段共聚物及诱导自组装行为

摘要

Poly (methyl methacrylate) -block-poly (tert-butyl acrylate) (PMMA-b-PtBA) was synthesized by reversible addition-fragmentation chain transfer polymerization (RAFT). The amphiphlic block copolymer, poly (methyl methacrylate)-block-poly ( acrylic acid ) ( PMMA-b-PAA) was prerared by the selective hydrolysis in the presence of trifluoroacetic acid.The structures of PMMA-b-PtBA and PMMA-b-PAA were evidenced by the means of 'HNMR, FTIR and GPC. Complex micelles were utilized through the coordination induced method of Ln3+ rare earth ion and PMMA-b-PAA in THF, whose morphology and diameter were characterized by transmission electron microscopy and dynamic light scattering. Results showed that the crosslinking of PMMA-b-PAA formed due to the coordination of it and rare earth ions, this resulted in the diameters of complex micelles being improved obviously comparing to those of polymer micelles without rare earth ions.%通过可逆-加成断裂链转移自由基聚合( RAFT)成功制备了聚甲基丙烯酸甲酯-聚丙烯酸叔丁酯嵌段共聚物( PMMA-b-PtBA),在三氟乙酸的作用下选择性水解,得到聚甲基丙烯酸甲酯-聚丙烯酸双亲性嵌段共聚物( PMMA-b-PAA),利用1HNMR,FTIR和GPC对两种产物的结构进行了表征.将Ln3+稀土离子与PMMA-b-PAA通过“配位诱导”作用在THF溶剂中形成配合物胶束,并用TEM和DLS测定了胶束的形貌和粒径.结果表明,共聚物与稀土离子配位而发生交联,导致配合物胶束粒径比单纯共聚物的胶束粒径明显增大.