席夫碱-铝配合物的合成及对丙交酯的立体选择性聚合  

Synthesis of Aluminum-Schiff Base Catalyst and Their Stereoselective Polymerization of Lactides

作　　者：曲智[1,2] 李想[1] 庞烜[1] 段然龙 高波[1] 陈学思[1] 

机构地区：[1]中国科学院长春应用化学研究所 生态环境高分子材料重点实验室,长春130022 [2]中国科学院大学,北京100049

出　　处：《高等学校化学学报》2014年第3期626-632,共7页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:21204082,51173183,21004061,51021003);国家“八六三”计划项目(批准号:2011AA02A202)资助~~

摘　　要：设计、合成了一系列不对称席夫碱配体,得到了相应的金属铝配合物.研究了配合物在外消旋丙交酯的开环聚合反应中的催化性能.结果表明,系列配合物对外消旋丙交酯(rac-LA)的聚合催化活性明显提高,并具有立体选择性.A series of asymmetric Schiff-base ligands and their aluminum Al （Ⅲ） complexes that contained different steric substituent were designed and synthesized. The structures of ligands and their complexes were characterized. One crystal of Schiff-base aluminum complex was obtained. X-Ray diffraction analyses showed that the central aluminum atoms of the complex adopt twisted four pyramid geometry. They were chiral but ra-cemic complexes with two enantiomers in solid state. Their catalytic properties in the solution polymerization of racemic lactides（ rac-LA） in the presence of 2-propanol were investigated in detail. All of the complexes had poor stereoselectivity for ring-opening polymerization（ROP） of rac-LA（Pm about 0.55）, the polymerization rate of asymmetric complex was much faster than symmetric complex in ROP of rac-LA. The results evaluate that the substituent of ligands has great influence on the catalytic properties of the complex.

关 键 词：丙交酯 生物降解 立体选择性聚合 席夫碱 

分 类 号：O631[理学—高分子化学]