Silyl-Terminated Ethylene-co-Norbornene Copolymers by Organotitanium-Based Catalysts

Roberto Marconi; Andrea Ravasio; Laura Boggioni; Incoronata Tritto

doi:10.1002/marc.200800559

Silyl-Terminated Ethylene-co-Norbornene Copolymers by Organotitanium-Based Catalysts

Macromol Rapid Commun. 2009 Jan 2;30(1):39-44. doi: 10.1002/marc.200800559. Epub 2008 Nov 21.

Authors

Roberto Marconi¹, Andrea Ravasio, Laura Boggioni, Incoronata Tritto

Affiliation

¹ Istituto per lo Studio delle Macromolecole, Consiglio Nazionale delle Ricerche, Via E. Bassini 15, I-20133 Milano, Italy; Dipartimento di Chimica Generale, Università degli Studi di Pavia, Via Taramelli 12, 27100, Pavia, Italy.

PMID: 21706536
DOI: 10.1002/marc.200800559

Abstract

Ethylene (E) and norbornene (N) were copolymerized in the presence of PhSiH(3) as chain-transfer agent with [Ti(η(5) :η(1) -C(5) Me(4) SiMe(2) NBu(t) )(η(1) -Me)(2) ] precatalyst combined with [Ph(3) C][B(C(6) F(5) )(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 SiH(2) Ph chain-ends were observed by (1) H NMR. The Si heteroatom is predominantly adjacent to ethylene units in E-co-N copolymers with high N content.