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Evidence of the Quasi‐Living Character of the ansa ‐Zirconocene/MAO‐Catalyzed Copolymerization of Ethylene and Norbornene
Author(s) -
Jansen Johannes Carolus,
Mendichi Raniero,
Locatelli Paolo,
Tritto Incoronata
Publication year - 2001
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/1521-3927(20011101)22:17<1394::aid-marc1394>3.0.co;2-b
Subject(s) - norbornene , molar mass , copolymer , ethylene , polymer chemistry , dispersity , catalysis , polymerization , kinetics , polymer , materials science , chemistry , organic chemistry , physics , quantum mechanics
Abstract The kinetics of the ethylene‐norbornene copolymerization, catalyzed by rac ‐Et(Ind) 2 ZrCl 2 /MAO, 90% rac /10% meso ‐Et(4,7‐Me 2 Ind) 2 ZrCl 2 /MAO and rac ‐H 2 C(3‐ tert ‐BuInd) 2 ZrCl 2 /MAO was followed by sampling from the reaction mixture at fixed time intervals. Catalyst activity, copolymer composition and molar mass were studied as a function of time. The polymers showed an unusually low polydispersity and a significant increase in their molar mass with time, suggesting a quasi‐living polymerization.