文献类型：期刊文献

英文题名：Highly active magnesium initiators for ring-opening polymerization of rac-lactide

作者：Wang, Liying[1]; Ma, Haiyan[1]

机构：[1] Laboratory of Organometallic Chemistry, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China

年份：2010

卷号：43

期号：16

起止页码：6535

外文期刊名：Macromolecules

收录：EI(收录号：20103413172365)

语种：英文

外文关键词：Magnesium compounds - X ray diffraction - Toluene - Catalyst activity - Single crystals

摘要：A series of magnesium silyamido complexes supported by monoanionic aminophenolato ligands which display extraordinarily high activity for the ring-opening polymerization of rac-lactide, were prepared. Single crystals of 2 suitable for X-ray diffraction studies were obtained by slightly cooling the saturated toluene solution. Preliminary kinetic studies of the polymerization of rac-lactide initiated by complex 1 in the presence of 1 equiv of isopropanol in toluene indicated a first-order dependence on the monomer concentration. Less active complex 2 was chose to study the NMR scale polymerization of rac-lactide in the presence of isopropanol to obtain some insight into the active species. The polymerization started instantaneously, and active oligomers end-capped with isopropoxy group could be identified. In conclusion, monomeric magnesium silylamido complexes 1-3 showed excellent catalytic activities for the ring-opening polymerization of rac-lactide at ambient temperature.