Highly stereoselective bimetallic complexes for lactide and ε-caprolactone polymerization

Xuan Pang; Ranlong Duan; Xiang Li; Zhiqiang Sun; Han Zhang; Xianhong Wang; Xuesi Chen

doi:10.1039/C4RA11126E

Highly stereoselective bimetallic complexes for lactide and ε-caprolactone polymerization

Xuan Pang,^a Ranlong Duan,^a Xiang Li,^a Zhiqiang Sun,^a Han Zhang,^a Xianhong Wang^a and Xuesi Chen*^a

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* Corresponding authors

^a Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, P. R. China
E-mail: xschen@ciac.ac.cn

Abstract

A series of Schiff-base compounds containing bimetallic ligands and two aluminum centers have been synthesized and characterized by ¹H, ¹³C NMR and elemental analysis. These compounds could be successfully used as catalysts for the polymerization of rac-lactide and ε-caprolactone. The polylactides (PLAs) prepared with these compounds were highly isotactic enriched (P_m = 0.97). The nature and steric hindrance of the ligands coordinated to the central metal ions remarkably influenced the polymer properties. Kinetic studies revealed that the polymerization was first order with respect to each of these compounds and lactide/caprolactone monomers. All the polymerizations were living, with good molecular weight control and relatively narrow molar mass distributions.

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Publication details

The article was received on 24 Sep 2014, accepted on 16 Oct 2014 and first published on 17 Oct 2014

Article type: Paper

DOI: 10.1039/C4RA11126E

Citation: RSC Adv., 2014,4, 57210-57217

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Highly stereoselective bimetallic complexes for lactide and ε-caprolactone polymerization

X. Pang, R. Duan, X. Li, Z. Sun, H. Zhang, X. Wang and X. Chen, RSC Adv., 2014, 4, 57210
DOI: 10.1039/C4RA11126E
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Highly stereoselective bimetallic complexes for lactide and ε-caprolactone polymerization

Abstract

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Highly stereoselective bimetallic complexes for lactide and ε-caprolactone polymerization

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