Bismuth(III ) Alkoxide Catalysts for Ring-Opening Polymerization of Lactides and ϵ-Caprolactone
| Autor: | Sirpa Vuorinen, Mohammed Lahcini, Timo Hatanpää, Markku R. Sundberg, Markku Leskelä, Timo Repo |
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| Rok vydání: | 2013 |
| Předmět: |
Lactide
Polymers and Plastics Bulk polymerization 010405 organic chemistry Organic Chemistry chemistry.chemical_element Solution polymerization 010402 general chemistry Condensed Matter Physics 01 natural sciences Ring-opening polymerization 0104 chemical sciences 3. Good health Bismuth chemistry.chemical_compound chemistry Polymerization Alkoxide Polymer chemistry Materials Chemistry Physical and Theoretical Chemistry Homoleptic |
| Zdroj: | Macromolecular Chemistry and Physics. 214:707-715 |
| ISSN: | 1022-1352 |
| DOI: | 10.1002/macp.201200521 |
| Popis: | Homoleptic bismuth alkoxide complexes, Bi(OR) 3 [R = i Pr (1), t Bu (2), and CMe 2 i Pr (3)], are used as catalysts in the ring-opening polymerization (ROP) of lactides. In contrast to 1, two bulkier bismuth alkoxides, 2 and 3, show high activity in the ROP of lactides in toluene at 75 °C. Notably, Bi III alkoxides 2 and 3 are more active in lactide ROP than Sn II octoate activated with n-butanol under identical reaction conditions. Bismuth alkoxides 2 and 3 exhibit a living behavior in the ROP of lactides that is demonstrated both in homopolymerization and in a polymerization resumption experiment. Polymerization of rac-lactide using 2 and 3 yields polylactide with a slight heterotactic bias. In addition, 2 is an efficient initiator for the ROP of e-caprolactone in bulk at 120 °C. Variation of the monomer-to-catalyst ratio yielded poly(e-caprolactone) with M n s up to 120 000 g mol ―1 in corrected gel-permeation chromatography (GPC) data. |
| Databáze: | OpenAIRE |
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