N-Heterocyclic carbene/Lewis acid-mediated ring-opening polymerization of propylene oxide. Part 1: Triisobutylaluminum as an efficient controlling agent
| Autor: | Junpeng Zhao, Qilei Song, Guangzhao Zhang, Stéphane Carlotti, Daniel Taton, Frédéric Peruch |
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| Přispěvatelé: | South China University of Technology [Guangzhou] (SCUT), Team 1 LCPO : Polymerization Catalyses & Engineering, Laboratoire de Chimie des Polymères Organiques (LCPO), Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Ecole Nationale Supérieure de Chimie, de Biologie et de Physique (ENSCBP)-Université de Bordeaux (UB)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Ecole Nationale Supérieure de Chimie, de Biologie et de Physique (ENSCBP)-Université de Bordeaux (UB)-Institut de Chimie du CNRS (INC) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Polymers and Plastics
General Physics and Astronomy 02 engineering and technology 010402 general chemistry 01 natural sciences Ring-opening polymerization Catalysis chemistry.chemical_compound Nucleophile Polymer chemistry Materials Chemistry Propylene oxide Lewis acids and bases bicomponent catalyst Organic Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences substituted epoxides block copolymers Monomer [CHIM.POLY]Chemical Sciences/Polymers chemistry Polymerization 0210 nano-technology anionic ring-opening polymerization Carbene N-heterocyclic carbene |
| Zdroj: | European Polymer Journal European Polymer Journal, Elsevier, 2020, 134, pp.109819. ⟨10.1016/j.eurpolymj.2020.109819⟩ |
| ISSN: | 0014-3057 1873-1945 |
| DOI: | 10.1016/j.eurpolymj.2020.109819⟩ |
| Popis: | International audience; Ring-opening polymerization (ROP) of propylene oxide (PO) is achieved at 25 °C either in bulk or in solution, using N-heterocyclic carbenes (NHCs) and triisobutylaluminum (i-Bu3Al) as a bicomponent catalytic system. Transfer to monomer was not observed and poly(propylene oxide)s with predictable molar masses up to 60 000 g·mol−1 and low dispersities were obtained. In presence/absence of an alcohol as the initiator, the polymerization of PO follows anionic or zwitterionic ROP mechanisms, respectively. The addition of the Lewis acid strongly improves the efficiency of NHCs for the polymerization of substituted epoxides. It is established that i-Bu3Al is involved both in the formation of an initiating/propagating complex of moderate basicity/nucleophilicity and in the coordination of PO, enabling the activation of the monomer towards the complexed nucleophilic active species. Block copolyethers are also prepared by PPO chain extension experiments. All (co)polyethers were thoroughly characterized by 1H NMR spectroscopy, SEC and MALDI-TOF mass spectrometry as means to prove the control and benefit of this NHC approach for epoxides ROP. |
| Databáze: | OpenAIRE |
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