Highly Active N,O Zinc Guanidine Catalysts for the Ring-Opening Polymerization of Lactide
| Autor: | Maximilian Schmidt, Paul McKeown, Sonja Herres-Pawlis, Ruth D. Rittinghaus, Alexander Hoffmann, Andreas Ohligschläger, Enver Akin, Martin Fuchs, Marcel A. Liauw, Matthew D. Jones, Pascal M. Schäfer |
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| Rok vydání: | 2017 |
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Molecular ring-opening polymerization Nitrogen General Chemical Engineering Molecular Conformation chemistry.chemical_element Zinc guanidine 010402 general chemistry 01 natural sciences Ring-opening polymerization Catalysis Polymerization Dioxanes chemistry.chemical_compound Reaction rate constant Materials Science(all) Energy(all) Polymer chemistry Environmental Chemistry General Materials Science Guanidine poly(lactide) Molar mass Lactide catalysis 010405 organic chemistry zinc Temperature 0104 chemical sciences Oxygen General Energy chemistry Chemical Engineering(all) |
| Zdroj: | Schäfer, P M, Fuchs, M, Ohligschläger, A, Rittinghaus, R, McKeown, P, Akin, E, Schmidt, M, Hoffmann, A, Liauw, M A, Jones, M & Herres-Pawlis, S 2017, ' Highly Active N,O Zinc Guanidine Catalysts for the Ring-Opening Polymerization of Lactide ', ChemSusChem, vol. 10, no. 18, pp. 3547-3556 . https://doi.org/10.1002/cssc.201701237 |
| ISSN: | 1864-564X |
| DOI: | 10.1002/cssc.201701237 |
| Popis: | New zinc guanidine complexes with N,O donor functionalities were prepared, characterized by X-Ray crystallography, and examined for their catalytic activity in the solvent-free ring-opening polymerization (ROP) of technical-grade rac-lactide at 150 °C. All complexes showed a high activity. The fastest complex [ZnCl2(DMEGasme)] (C1) produced colorless poly(lactide) (PLA) after 90 min with a conversion of 52 % and high molar masses (Mw=69 100, polydispersity=1.4). The complexes were tested with different monomer-to-initiator ratios to determine the rate constant kp. Furthermore, a polymerization with the most active complex C1 was monitored by in situ Raman spectroscopy. Overall, conversion of up to 90 % can be obtained. End-group analysis was performed to clarify the mechanism. All four complexes combine robustness against impurities in the lactide with high polymerization rates, and they represent the fastest robust lactide ROP catalysts to date, opening new avenues to a sustainable ROP catalyst family for industrial use. |
| Databáze: | OpenAIRE |
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