Influence of the nature of the ligand on the microstructure of poly D,L-lactides prepared with organoaluminum initiators

被引：26

作者：

Belleney, J

Wisniewski, M

Le Borgne, A

机构：

[1] Univ Paris 06, Lab Chim Polymeres, UMR 7610, F-75252 Paris 05, France

[2] Univ Paris 12, CNRS, UMR 7581, Lab Rech Polymeres, F-94320 Thiais, France

来源：

EUROPEAN POLYMER JOURNAL | 2004年 / 40卷 / 03期

关键词：

D; L-lactide; organoaluminum initiators; C-13; NMR; microstructure; ligand effect; stereoselectivity; propagation statistics;

D O I：

10.1016/j.eurpolymj.2003.11.001

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The polymerization of D,L-lactide with organoaluminum initiators bearing two different ligands, acetylacetone (1) and achiral Schiff's base (2), has been studied. The microstructure of the obtained polymers analyzed by high resolution C-13 NMR (125 MHz) is strongly influenced by the nature of the ligand. Al(acac)(3) (1) leads to stereocopolymers having random repartition of configurational units while polylactides prepared with aluminum methoxide derivatives bearing as ligand Schiff's base (2) present some degree of stereoregularity with preferential formation of isotactic sequences. Variation of the ligand linked to the initiator appears as one of the best tools for the moulding of the microstructure of obtained polylactides. (C) 2003 Elsevier Ltd. All rights reserved.

引用

页码：523 / 530

页数：8

共 23 条

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