Ring-opening polymerization of lactide initiated by magnesium and zinc alkoxides

被引：173

作者：

Wu, JC

Huang, BH

Hsueh, ML

Lai, SL

Lin, CC ^{[1
]}

机构：

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

[2] Ling Tung Coll, Sch Design, Taichung 408, Taiwan

来源：

POLYMER | 2005年 / 46卷 / 23期

关键词：

magnesium; L-lactide; ring opening polymerization;

D O I：

10.1016/j.polymer.2005.08.009

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 mono methylether Salen-type ligand, SalenMe-H (1) is prepared in a one flask reaction by condensation of trans-1,2-diaminocyclohexane with 2-methoxybenzenaldehyde and followed by the addition of 2,4-di-tert-butylsalicylaldehyde. Further reaction of 1 with Mg(OBn)(2) in THF produces a magnesium alkoxide, [(SalenMe)Mg(OBn)](2) (2). Compound 1 reacts with ZnEt2 yields monomeric complex (SalenMe)ZnEt (3), which further reacts with 1 molar equiv of benzyl alcohol giving [(SalenMe)Zn(OBn)](2) (4). Experimental results show that complexes 2 and 4 efficiently initiate the ring-opening polymerization of L-lactide and rac-lactide in a controlled fashion, yielding polymers with very low polydispersity indexes. Kinetic studies show a second-order dependency on [LA] and a first-order on [2] with magnesium complex 2 as an initiator. While zinc complex 4 is used as an initiator, the polymerization rate has a first order dependency on both [LA] and [4]. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：9784 / 9792

页数：9

共 35 条

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