| 摘要 |
Disclosed is a method for synthesizing star polymers having controlled tacticity. The method comprises reacting a lactone-based monomer having at least one stereocentre and a poly-functional initiator in the presence of at least one catalyst. In particular embodiments, the lactone-based monomer is L-lactide or DL-lactide, the poly-functional initiator is dipentaerythritol, and the at least one catalyst is an aluminum-salen catalyst (tBu[O,N,N,O] AlMe) or an aluminum-salan catalyst (Cl[O,N,N,O] AlMe). Star polymers comprising at least two arms and having heterotacticity bias, isotacticity bias, or stereoblocks of different tacticity bias are produced. Such star polymers are useful, for example, in controlled delivery of bioactive molecules
|
