Abstract

Linear aliphatic polyesters are degradable thermoplastic polymers, which can be obtained by ring-opening polymerization (ROP) of cyclic esters through a coordination-insertion mechanism. Aluminum based organometallic complexes have a leading position as efficient catalysts for this polymerization process. Aluminumalkyl complexes bearing salicylaldiminato ligands, although less explored, have been shown to be efficient and versatile catalysts for the ROP of various cyclic esters. These species have the potential to function as active catalysts in the ROP because of their less coordinatively saturated nature with respect to analogous SALEN-type complexes. They have been used as efficient catalysts in the ROP of commercially available cyclic esters, such as ε-caprolactone, l-lactide, rac-lactide, and glycolide. Moreover, they resulted in efficient catalysts for the ROP of cyclic esters with large ring-size and for the ROP of functionalized lactide. Furthermore, they have been used in the co- and ter-polymerization of various cyclic esters affording well controlled polymerization and a plethora of microstructural architectures, ranging from random to block to multiblock.

Highlights

  • Aliphatic polyesters are a class of natural and synthetic polymers with good mechanical and thermal properties

  • A large variety of aluminum‐based salicylaldiminato complexes have been described and used in the ring-opening polymerization (ROP) of various cyclic esters, their structural features are summarized in Table 1 with reference to the proper literature

  • We have reported the ROP of GA catalyzed by the dimethyl(salicilaldiminato)aluminum compounds

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Summary

Introduction

Aliphatic polyesters are a class of natural and synthetic polymers with good mechanical and thermal properties. The uniqueness of the aliphatic polyesters lies in their immense diversity and synthetic versatility They can be prepared by a variety of monomers via enzymatic route or synthetic approaches, i.e., ring-opening polymerization (ROP) of cyclic esters or polycondensation routes [5]. The step-growth step‐growth or expensive polycondensation of diols with (or diesters), or of polymerization or polycondensation of diols with diacids (or diesters), or of hydroxyacids hydroxyacids is a low‐cost process It suffers from several drawbacks and itisisa low-cost scarcely process. The coordinative by metal-based catalysts allows aa better mechanism Between these methods, the coordinative ROP by metal‐based catalysts allows better control on able toto mediate thethe of control on the the polymer polymermicrostructure.

Ring‐opening
H5 C6H5
26 It degrades by hydrolytic
Ring-opening
Polymerization of Lactide
Copolymerization of ε‐Caprolactone and Lactide
Copolymerization of ε-Caprolactone and Lactide
Salicylaldiminato-Aluminum in the Ring-Opening of Glycolide as
Copolymerization of Lactide and Glycolide
Ring‐Opening
Ring-Opening
Findings
Conclusions
Full Text
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