Make or break: Mg(ii )- and Zn(ii )-catalen complexes for PLA production and recycling of commodity polyesters
| Autor: | Gabriele Kociok-Köhn, Emma Anna Carolina Emanuelsson, Matthew D. Jones, Paul McKeown, Oliver J. Driscoll, Jack Payne |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
chemistry.chemical_classification
Lactide Polymers and Plastics Ligand Organic Chemistry Bioengineering Polymer Nuclear magnetic resonance spectroscopy Biochemistry Catalysis Metal Polyester chemistry.chemical_compound chemistry Polymerization visual_art visual_art.visual_art_medium Nuclear chemistry |
| Zdroj: | Polymer Chemistry. 12:1086-1096 |
| ISSN: | 1759-9962 1759-9954 |
| DOI: | 10.1039/d0py01519a |
| Popis: | Recently we reported a series of highly active Al(III)-complexes bearing a catalen ligand support for lactide polymerisation, observing unprecedented activity in the melt. Herein we report diversification of the metal to furnish a series of well-defined dimeric Zn(II)- and Mg(II)-complexes, which were fully characterised by X-ray crystallography and NMR spectroscopy. The production of biocompatible atactic PLA from rac-LA in solution and under industrially preferred solvent-free conditions was demonstrated, typically observing good activity and Mn control with a broad range of dispersities (Đ = 1.08–2.04). Mg(II)-Complexes were shown to facilitate the relatively mild methanolysis of PLA, achieving up to 64% conversion to Me-LA within 8 h at 80 °C in THF. Further kinetic analysis found [Mg(1,3)]2 to have kapp values of 0.628 ± 0.0536 {4 wt% cat. loading} and 0.265 ± 0.0193 h−1 {8 wt% cat. loading} respectively for the rate of consumption of PLA. Preliminary work extended polymer scope to PET from various sources, demonstrating catalyst versatility. |
| Databáze: | OpenAIRE |
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