Taking the Next Step—Model‐Based Analysis of Robust and Non‐Toxic Zn Catalysts for the Ring Opening Polymerization of Lactide in the Polymer Melt (Adv. Sustainable Syst. 2/2023)

Conen, Niclas; Fuchs, Martin; Hoffmann, Alexander; Herres‐Pawlis, Sonja; Jupke, Andreas

doi:10.1002/adsu.202370006

Cited by 2 publications

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“…Over the course of the polymerization time, this leads to an overall decreased catalytic activity. [28] However, the reached lactide conversion further indicates the applicability of the catalyst under industrial conditions.…”

Section: Ring-opening Polymerization Of Lactidementioning

confidence: 97%

A Multitool for Circular Economy: Fast Ring‐Opening Polymerization and Chemical Recycling of (Bio)polyesters Using a Single Aliphatic Guanidine Carboxy Zinc Catalyst

et al. 2023

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A new aliphatic hybrid guanidine N,O‐donor ligand (TMGeech) and its zinc chloride complex ([ZnCl2(TMGeech)]) are presented. This complex displays high catalytic activity for the ring‐opening polymerization (ROP) of lactide in toluene, exceeding the toxic industry standard tin octanoate by a factor of 10. The high catalytic activity of [ZnCl2(TMGeech)] is further demonstrated under industrially preferred melt conditions, reaching high lactide conversions within seconds. To bridge the gap towards a sustainable circular (bio)economy, the catalytic activity of [ZnCl2(TMGeech)] for the chemical recycling of polylactide (PLA) by alcoholysis in THF is investigated. Fast production of different value‐added lactates at mild temperatures is demonstrated. Selective PLA degradation from mixtures with polyethylene terephthalate (PET) and a polymer blend, catalyst recycling, and a detailed kinetic analysis are presented. For the first time, chemical recycling of post‐consumer PET producing different value‐added materials is demonstrated using a guanidine‐based zinc catalyst. Therefore, [ZnCl2(TMGeech)] is a promising, highly active multitool, not only to implement a circular (bio)plastics economy, but also to tackle today's ongoing plastics pollution.

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Section: Ring-opening Polymerization Of Lactidementioning

confidence: 97%

A Multitool for Circular Economy: Fast Ring‐Opening Polymerization and Chemical Recycling of (Bio)polyesters Using a Single Aliphatic Guanidine Carboxy Zinc Catalyst

et al. 2023

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“…[ 6 ] In the following decades, zinc‐based catalysts have been studied by numerous research groups. [ 7–34 ] Zinc powder and zinc oxide (which covers the surface of the zinc powder) were the first catalysts studied by several research groups. However, for medical or pharmaceutical applications the zinc powder needs to be removed from the PLA by filtration or centrifugation and ZnO showed a high tendency to racemize l ‐lactide.…”

Section: Introductionmentioning

confidence: 99%

Syntheses of Cyclic Poly(l‐lactide)s by Means of Zinc‐Based Ring‐Opening Polymerization with Simultaneous Polycondensation (ROPPOC) Catalysts

Kricheldorf

Scheliga

Weidner

2023

Macro Chemistry & Physics

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Ring‐opening polymerizations of l‐lactide are studied in bulk at 140 or 160 °C with zinc n‐hexanoate, zinc 4‐chlorothiophenolate, and zinc pentafluoro thiophenolate (ZnSPF) as catalysts. The reactivity increases in the given order. With all three catalysts a high fraction of cycles is obtained only at polymerization (annealing) times around 7 d. With ZnSPF weight average molecular weights (Mw) up to 178 000, a Tm around 199 °C and a ΔHm around 99 J g−1 w ere achieved. The samples annealed for 4 or 7 d also display a saw tooth pattern of the mass peak distribution in the matrix‐assisted laser desorption/ionization time of flight spectra indicating transesterification reactions across the surface of extended ring crystals. This process optimizes the thermodynamical properties of the crystalline cyclic polylactides and is responsible for the high Tm and ΔHm values.

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Taking the Next Step—Model‐Based Analysis of Robust and Non‐Toxic Zn Catalysts for the Ring Opening Polymerization of Lactide in the Polymer Melt (Adv. Sustainable Syst. 2/2023)

Cited by 2 publications

References 0 publications

A Multitool for Circular Economy: Fast Ring‐Opening Polymerization and Chemical Recycling of (Bio)polyesters Using a Single Aliphatic Guanidine Carboxy Zinc Catalyst

A Multitool for Circular Economy: Fast Ring‐Opening Polymerization and Chemical Recycling of (Bio)polyesters Using a Single Aliphatic Guanidine Carboxy Zinc Catalyst

Syntheses of Cyclic Poly(l‐lactide)s by Means of Zinc‐Based Ring‐Opening Polymerization with Simultaneous Polycondensation (ROPPOC) Catalysts

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