Air-Stable Salen-Iron Complexes: Stereoselective Catalysts for Lactide and ε-Caprolactone Polymerization through in Situ Initiation

被引：87

作者：

Duan, Ranlong ^{[1
]}

Hu, Chenyang ^{[1
,2
]}

Li, Xiang ^{[1
]}

Pang, Xuan ^{[1
]}

Sun, Zhiqiang ^{[1
]}

Chen, Xuesi ^{[1
]}

Wang, Xianhong ^{[1
]}

机构：

[1] Chinese Acad Sci, Changchun Inst Appl Chem, Key Lab Polymer Ecomat, 5625 Renmin St, Changchun 130022, Jilin, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

来源：

MACROMOLECULES | 2017年 / 50卷 / 23期

基金：

中国国家自然科学基金;

关键词：

RING-OPENING POLYMERIZATION; CHAIN-END CONTROL; ALUMINUM COMPLEXES; ALKOXIDE INITIATOR; POLY(LACTIC ACID); RACEMIC LACTIDE; PROPYLENE-OXIDE; RAC-LACTIDE; LIGANDS; SELECTIVITY;

D O I：

10.1021/acs.macromol.7b01766

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 series of iron(III) chloride complexes based upon Schiff base framework have been synthesized and characterized by mass spectra, elemental analysis, and X-ray crystallography. These bench-stable complexes were for the first time capable as highly efficient catalysts for lactide and epsilon-caprolactone polymerization in the presence of propylene oxide (PO), greatly surpassing conventional aluminum analogies. Electron-withdrawing substituents as well as elevated temperature boosted the activity while a bulky group on salicylaldehyde moieties abnormally produces the same effect, whereas rigid backbone retarded the reactivity. Polylactide tactics ranging from isotactic to hererotactic enchainment were obtained by tuning the ligand backbone and substituents. The stereoselectivity was confirmed to proceed via a chain-end control mechanism by kinetic studies using different isomers of lactide, and the overall polymerization process was also investigated in detail by the oligomer mass spectrum as well as end group (-OCHMeCH2Cl) analysis of polymer via H-1, C-13, and two-dimensional (2-D) NMR characterizations.

引用

页码：9188 / 9195

页数：8

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