title: Silyl-Terminated Ethylene-co-Norbornene Copolymers by Organotitanium-Based Catalysts.
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.
authors.affiliation: 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.
authors.forename: Roberto
authors.initials: R
authors.lastname: Marconi
authors.forename: Andrea
authors.initials: A
authors.lastname: Ravasio
authors.forename: Laura
authors.initials: L
authors.lastname: Boggioni
authors.forename: Incoronata
authors.initials: I
authors.lastname: Tritto