Polymerization of l-lactide with SnCl2: A Low Toxic and Eco-friendly Catalyst
| Autor: | Steffen M. Weidner, Hans R. Kricheldorf |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Environmental Engineering
Condensation polymer Materials science Polymers and Plastics Fraction (chemistry) 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Catalysis Metal chemistry.chemical_compound Matrix-assisted laser desorption/ionization Monomer chemistry Polymerization visual_art Materials Chemistry visual_art.visual_art_medium 0210 nano-technology Salicylic acid Nuclear chemistry |
| Zdroj: | Journal of Polymers and the Environment. 29:2504-2516 |
| ISSN: | 1572-8919 1566-2543 |
| DOI: | 10.1007/s10924-020-02042-w |
| Popis: | Polymerizations of l-lactide catalyzed either by neat SnCl2 or by SnCl2 + difunctional cocatalysts were conducted in bulk at 180, 160 and 140 °C with variation of the Lac/Cat ratio and time. With neat SnCl2 poly(L-lactide) having weight average molecular weights (uncorrected Mw’s) up to 190 000 g mol−1 were obtained mainly consisting of linear chains. Addition of salicylic acid or 1,1-bisphenol yielded a higher fraction of cyclic polylactides but lower molecular weights. Furthermore, SnCl2 was compared with Bu2SnCl2 and various other metal chlorides and the best results were obtained with SnCl2. With ethyl L-lactate as initiator SnCl2-catalyzed ROPs were performed at 120 °C and the lac/initiator ratio was varied. All these experiments were conducted under conditions allowing for comparison with ROPs catalyzed with neat Sn(II)-2-ethyhexanoate. Such a comparison was also performed with ε-caprolactone as monomer. |
| Databáze: | OpenAIRE |
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