Zinc complexes for PLA formation and chemical recycling

Journal article


McKeown, P., Roman Ramirez, L., Bates, S., Wood, J. and Jones, M. (2019). Zinc complexes for PLA formation and chemical recycling . ChemSusChem. 12 (24), pp. 5233-5238. https://doi.org/10.1002/cssc.201902755
AuthorsMcKeown, P., Roman Ramirez, L., Bates, S., Wood, J. and Jones, M.
Abstract

A series of Zn II complexes, based on propylenediamine Schiff bases, have been prepared and fully characterized. X-ray crystallography and NMR spectroscopy identified significant differences in the solid and solution state for the Zn II species. All complexes have been applied to the ring-opening polymerization of l-lactide with emphasis on industrial conditions. High conversion and good molecular weight control were generally achievable for Zn(A–D) 2, and high-molecular-weight poly(lactic acid) (PLA) was prepared in 1 min at a 10 000:1:33 [lactide]/[Zn]/[BnOH] loading. The more active Zn II catalysts were also applied to PLA degradation to alkyl lactate under mild conditions. Zn(A–B) 2 demonstrated high activity and selectivity in this process with PLA being consumed within 1 h at 50 °C. Zn(C–D) 2 were shown to be less active, and these observations can be related to the catalysts’ structure and the degradation mechanism. Initial results for the degradation of poly(ethylene terephthalate) and mixed feeds are also presented, highlighting the broader applicability of the systems presented.

Year2019
JournalChemSusChem
Journal citation12 (24), pp. 5233-5238
PublisherWiley
ISSN1864-564X
Digital Object Identifier (DOI)https://doi.org/10.1002/cssc.201902755
Publication dates
Print12 Nov 2019
Publication process dates
Accepted01 Nov 2019
Deposited21 Mar 2024
Accepted author manuscript
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Open
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