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Abstract
This review describes the recent advances (from 2008 onwards) in the use of Schiff-base metal complexes as catalysts for the ring opening polymerization (ROP) of cyclic esters. The synthesis and structure of the metal complexes, as well as all aspects concerning the polymerization process and the characteristics of the polymers formed, will be discussed.
Highlights
Over the past two decades, increasing attention has been dedicated to the development of sustainable polymers that, while retaining all the positive features associated with polyolefins, do not require centuries to biodegrade in the natural environment
These polymers are synthesized via the metal-catalyzed ring opening polymerization (ROP) of cyclic esters, with the most common monomers being ε-caprolactone (ε-CL), δ-valerolactone (δ-VL) and lactide (LA)
We describe the recent outputs concerning the use of Schiff-base metal complexes as catalysts for the ROP of cyclic esters
Summary
Over the past two decades, increasing attention has been dedicated to the development of sustainable polymers that, while retaining all the positive features associated with polyolefins, do not require centuries to biodegrade in the natural environment In this scenario, polylactones have emerged as suitable candidates, and currently find applications in several fields, spanning from the food and packaging industries to medicinal and pharmaceutical applications [1,2,3,4,5]. Most of the research has focused on the development of catalysts based on earth abundant and non-toxic metals such as Al and Zn (Chart 1) This is not surprising, considering the need for cost-effective and more sustainable processes.
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