Silyl-Terminated Ethylene-co-Norbornene Copolymers by Organotitanium-Based Catalysts
Ethylene (E) and norbornene (N) were copolymerized in the presence of PhSiH3 as chain‐transfer agent with [Ti(η5:η1‐C5Me4SiMe2NBut)(η1‐Me)2] precatalyst combined with [Ph3C][B(C6F5)4]. The silane was introduced at chain‐ends of E‐co‐N copolymers with concomitant reinitiation of the growing polymer c...
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Veröffentlicht in: | Macromolecular rapid communications. 2009-01, Vol.30 (1), p.39-44 |
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Hauptverfasser: | , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Ethylene (E) and norbornene (N) were copolymerized in the presence of PhSiH3 as chain‐transfer agent with [Ti(η5:η1‐C5Me4SiMe2NBut)(η1‐Me)2] precatalyst combined with [Ph3C][B(C6F5)4]. The silane was introduced at chain‐ends of E‐co‐N copolymers with concomitant reinitiation of the growing polymer chain. The concentrations of the silane and polymer molecular weight are inversely correlated. The characteristic signals of SiH2Ph chain‐ends were observed by 1H NMR. The Si heteroatom is predominantly adjacent to ethylene units in E‐co‐N copolymers with high N content. |
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ISSN: | 1022-1336 1521-3927 |
DOI: | 10.1002/marc.200800559 |