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“Like Recycles Like”: Selective Ring‐Closing Depolymerization of Poly(L‐Lactic Acid) to L‐Lactide
Wallenberg Wood Science Center, WWSC, Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, Stockholm, Sweden.
Wallenberg Wood Science Center, WWSC, Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, Stockholm, Sweden.
Wallenberg Wood Science Center, WWSC, Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, Stockholm, Sweden.ORCID iD: 0000-0002-5081-1835
Wallenberg Wood Science Center, WWSC, Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, Stockholm, Sweden.
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2022 (English)In: Angewandte Chemie International Edition, ISSN 1433-7851, E-ISSN 1521-3773, Vol. 61, no 33, article id e202204531Article in journal (Refereed) Published
Abstract [en]

Chemical recycling of poly(L-lactic acid) to the cyclic monomer L-lactide is hampered by low selectivity and by epimerization and elimination reactions, impeding its use on a large scale. The high number of side reactions originates from the high ceiling temperature (Tc) of L-lactide, which necessitates high temperatures or multistep reactions to achieve recycling to L-lactide. To circumvent this issue, we utilized the impact of solvent interactions on the monomer–polymer equilibrium to decrease the Tc of L-lactide. Analyzing the observed Tc in different solvents in relation to their Hildebrand solubility parameter revealed a “like recycles like” relationship. The decreased Tc, obtained by selecting solvents that interact strongly with the monomer (dimethyl formamide or the green solvent γ-valerolactone), allowed chemical recycling of high-molecular-weight poly(L-lactic acid) directly to L-lactide, within 1–4 h at 140 °C, with >95 % conversion and 98–99 % selectivity. Recycled L-lactide was isolated and repolymerized with high control over molecular weight and dispersity, closing the polymer loop.

Place, publisher, year, edition, pages
John Wiley & Sons, 2022. Vol. 61, no 33, article id e202204531
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Polymer Chemistry
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URN: urn:nbn:se:liu:diva-207528DOI: 10.1002/anie.202204531OAI: oai:DiVA.org:liu-207528DiVA, id: diva2:1896648
Funder
Knut and Alice Wallenberg FoundationAvailable from: 2024-09-10 Created: 2024-09-10 Last updated: 2024-12-05Bibliographically approved

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Olsen, Peter

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