Ring-opening polymerization of lactides initiated by zinc alkoxides derived from NNO-tridentate ligands

被引：240

作者：

Chen, Hsuan-Ying ^{[1
]}

Tang, Hui-Yi ^{[1
]}

Lin, Chu-Chieh ^{[1
]}

机构：

[1] Natl Chung Hsing Univ, Dept Chem, Taichung 402, Taiwan

来源：

MACROMOLECULES | 2006年 / 39卷 / 11期

关键词：

D O I：

10.1021/ma060471r

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

A new series of dinuclear zinc complexes of the types [LZnEt](2) and [LZn(mu-OBn)](2) ( where L = NNO-tridentate Schiff base ligand) have been prepared. The activities of zinc alkoxides, [LZn(mu-OBn)](2), toward the ring-opening polymerization of L-lactide have been investigated. Experimental results indicate that the reactivity of [LZn(mu-OBn)](2) was dramatically affected by both the electronic and steric effect of the substituents on the Schiff base. The polymerization kinetics using [(LZn)-Zn-1(mu-OBn)](2) ( 2a) as an initiator were also studied, and the experimental results reveal that the rate of reaction is first-order, which depends on both [LA] and [(LZn)-Zn-1(mu-OBn)] (2). Furthermore, the heterotactic PLA with Pr up to 91% can be achieved by initiating of [(LZn)-Zn-5(mu-OBn)](2) in CH2Cl2 at - 55 degrees C.

引用

页码：3745 / 3752

页数：8

共 58 条

[1] Synthesis and characterization of thermoset biodegradable elastomers based on star-poly(ε-caprolactone-co-D,L-lactide) [J].