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中文摘要：
以非手性的席夫碱-异丙氧基铝（Ⅱ）引发外消旋丙交酯（roc-LA）的立构选择性聚合．其聚合动力学研究结果表明，聚合反应对于单体符合一级反应动力学．所得聚合物的数均分子量与单体转化率成正比，并且分子量分布很窄，表明该聚合反应具有良好的可控性．此外所得的聚外消旋乳酸是tm为179℃的结晶性聚合物．^13C NMR和同核去偶^1H NMR谱表明，所得的聚乳酸是一种立构嵌段聚合物，平均嵌段长度为11个乳酸单元．
英文摘要：
An achiral Schiff-base isopropoxide aluminum complex（Ⅱ） was used for the stereoselective ringopening polymerization of rac-lactide. The kinetics studies indicated that rac-lactide polymerization was first order kinetics to monomer concentration. There was linear relationship between the monomer conversion and molecular weights（Mn） of the polymer with a narrow molecular distribution. These phenomena indicated that the polymerization was well controllable. Moreover, the obtained poly （rac-lactide） was crystalline polymer with relative high tm（ 179℃）. ^13C NMR and homonuclear decoupled ^1H NMR spectra revealed that the polymerization of rac-lactide initiated by complex（Ⅱ） resulted in the isotactic stereoblock polymer, which contained blocks with an average of 11 units of enantiomerically pure lactic acid.
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