申请人:Board of Trustees operating Michigan State University
公开号:US20010044514A1
公开(公告)日:2001-11-22
The present invention provides a process for the direct synthesis of high melting polymers made from dimeric cyclic esters. In particular, the present invention provides a process for synthesis of polylactic acid (PLA) from racemic materials such as racemic lactide and polymandelide from mandelide. The process further provides racemic metal organic ligand catalysts such as racemic salbinap that catalyzes the polymerization of racemic dimeric cyclic ester monomers to a polylactide stereocomplex. Polymandelide and mixed dimeric cyclic esters are also prepared in the presence of low amounts of water.
本发明提供了一种直接合成高熔点聚合物的方法,该聚合物由二聚环酯制成。具体来说,本发明提供了一种从外消旋材料,如外消旋乳酸内酯,合成聚乳酸(PLA)和从曼德酸内酯制备的聚曼德酯的方法。该过程还提供了外消旋金属有机配体催化剂,如外消旋萨比纳普,催化外消旋二聚环酯单体的聚合形成聚乳酸立体复合物。在低水含量的条件下,还可以制备聚曼德酯和混合二聚环酯。