Secondary Alkene Insertion and Precision Chain-Walking: A New Route to Semicrystalline 'Polyethylene' from α-Olefins by Combining Two Rare Catalytic Events
| Autor: | Olafs Daugulis, Kristine Klimovica, Emil B. Lobkovsky, Tulaza Vaidya, Anne M. LaPointe, Geoffrey W. Coates, Ivan Keresztes |
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| Rok vydání: | 2014 |
| Předmět: |
Models
Molecular chemistry.chemical_classification Molecular Structure Alkene General Chemistry Polymer Alkenes Polyethylene Crystallography X-Ray Biochemistry Catalysis Polymerization Amorphous solid chemistry.chemical_compound Crystallinity Colloid and Surface Chemistry chemistry Nickel Chain walking Polymer chemistry Organometallic Compounds Coordination polymerization Imines |
| Zdroj: | Journal of the American Chemical Society. 136:7213-7216 |
| ISSN: | 1520-5126 0002-7863 |
| DOI: | 10.1021/ja502130w |
| Popis: | While traditional polymerization of linear α-olefins (LAOs) typically provides amorphous, low T(g) polymers, chain-straightening polymerization represents a route to semicrystalline materials. A series of α-diimine nickel catalysts were tested for the polymerization of various LAOs. Although known systems yielded amorphous or low-melting polymers, the "sandwich" α-diimines 3-6 yielded semicrystalline "polyethylene" comprised primarily of unbranched repeat units via a combination of uncommon regioselective 2,1-insertion and precision chain-walking events. |
| Databáze: | OpenAIRE |
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