关键词: 乳酸, 水, 烷基铝, Ｘ射线衍射分析, 稀土金属络合物, 聚合催化剂, 开环聚合, 粘均分子量

Catalysts composed of rare earth compounds, (iso-Bu)3Al, and water were developed for the preparation of poly(lactic acid). D,L-Lactide could be polymd. into poly(lactic acid) with high yield and controllable mol. wt. in PhMe solution using the above catalysts.

Key words: LACTIC ACID, WATER, ALUMINIUM ALKYLS, X-RAY DIFFRACTION ANALYSIS, RARE EARTH METAL COMPLEX, POLYMERISATION CATALYST, RING OPEN POLYMERIZATION, VISCOSITY AVERAGE MOLECULAR WEIGHT