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New Group IV Metallocene Systems Active in the Copolymerization of α ‐Olefins and Conjugated Dienes
Author(s) -
Napoli Mariagrazia,
Pragliola Stefania,
Costabile Chiara,
Longo Pasquale
Publication year - 2006
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200500457
Subject(s) - methylaluminoxane , metallocene , copolymer , polymer chemistry , cyclopentane , chemistry , cyclopropane , catalysis , isopropyl , conjugated system , organic chemistry , polymerization , ring (chemistry) , polymer
Summary: Rac ‐[CH 2 (2,4‐di‐ tert ‐butyl‐cyclopentadienyl) 2 ]ZrCl 2 ( 1 ), rac ‐[CH 2 (3‐ tert ‐butyl‐4,5,6,7‐tetrahydroindenyl) 2 ]ZrCl 2 ( 2 ), rac ‐[CH 2 (3‐isopropyl‐4,5,6,7‐tetrahydroindenyl) 2 ]ZrCl 2 ( 3 ), and rac ‐[CH 2 (3‐methyl‐4,5,6,7‐tetrahydroindenyl) 2 ]ZrCl 2 ( 4 ) were synthesized and characterized by 1 H NMR analysis. These C 2 symmetric ansa ‐zirconocenes, activated with methylaluminoxane (MAO), were able to promote copolymerization of ethene and 1,3‐butadiene. The structures of the copolymers are strongly influenced by zirconocene utilized as catalytic precursor. Depending on the reaction conditions polyethenes containing cyclopropane and cyclopentane rings, or 1,1‐ 1,3‐butadiene inserted constitutional units, were obtained.Structures of the synthesized catalytic precursors.