Mono- and dimeric zinc(ii) complexes for PLA production and degradation into methyl lactate – a chemical recycling method?
Polymer Chemistry Pub Date: 2020-02-27 DOI: 10.1039/D0PY00192A
Abstract
A series of well-defined mono- and dimeric Zn(II)-complexes were prepared and fully characterised by X-ray crystallography and NMR spectroscopy. Their application to the ROP of rac-LA to produce biocompatible atactic PLA was demonstrated in both solution and under industrially preferred melt conditions at 180 °C with a [rac-LA]?:?[Init]?:?[BnOH] of 3000?:?1?:?10. Exceptional activity was observed in all instances, albeit with generally poor molecular weight control (Mn) and broad dispersities (?), with dimers outperforming their monomeric counterparts. The propensity of all Zn(II)-complexes to facilitate PLA degradation into methyl lactate (Me-LA) under mild conditions is also demonstrated. Zn(2–3)2 were identified as the outstanding candidates, achieving full conversion to Me-LA within 8 h at 80 °C in THF. Further degradation kinetic analysis revealed Zn(2–3)2 to have kapp values of 0.63 ± 0.051 and 0.44 ± 0.029 h?1 for the rate of consumption of PLA respectively.
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Journal Name：Polymer Chemistry
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CAS no.: 89640-58-4
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