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Improvement of catalytic activity and comonomer response in ethylene/norbornene copolymerization initiated with ansa-metallocene

Improvement of catalytic activity and comonomer response in ethylene/norbornene copolymerization... AbstractThe copolymerization of ethylene (E) and norbornene (N) was carried out with ansa-metallocenes such as rac-Et(Ind)2ZrCl2 (1) and iPr(CpFlu)2ZrCl2 (2) cocatalyzed by modified methylaluminoxane in the presence of a 3rd monomer. As 3rd monomers, not only ɑ-olefins but also vinyl monomers were used. With the addition of a small amount of 3rd monomer, the catalyst activity of 1 and 2 could increase depending on the structure and amount of 3rd monomer added. The glass transition temperature (Tg) of polymer obtained in the presence of a 3rd monomer was higher than that of E/N copolymer. By using an appropriate mixed medium, the catalyst activity and Tg of the polymer could be adjusted. With 13C NMR analysis, it was found that the incorporation of N in the polymer was enhanced by the addition of 3rd monomer. The 3rd monomer effect was also observed for the copolymerization system of E and 5-ethylidene-2-norbornene. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png e-Polymers de Gruyter

Improvement of catalytic activity and comonomer response in ethylene/norbornene copolymerization initiated with ansa-metallocene

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Publisher
de Gruyter
Copyright
© 2013 by Walter de Gruyter GmbH & Co.
ISSN
2197-4586
eISSN
1618-7229
DOI
10.1515/epoly.2001.1.1.179
Publisher site
See Article on Publisher Site

Abstract

AbstractThe copolymerization of ethylene (E) and norbornene (N) was carried out with ansa-metallocenes such as rac-Et(Ind)2ZrCl2 (1) and iPr(CpFlu)2ZrCl2 (2) cocatalyzed by modified methylaluminoxane in the presence of a 3rd monomer. As 3rd monomers, not only ɑ-olefins but also vinyl monomers were used. With the addition of a small amount of 3rd monomer, the catalyst activity of 1 and 2 could increase depending on the structure and amount of 3rd monomer added. The glass transition temperature (Tg) of polymer obtained in the presence of a 3rd monomer was higher than that of E/N copolymer. By using an appropriate mixed medium, the catalyst activity and Tg of the polymer could be adjusted. With 13C NMR analysis, it was found that the incorporation of N in the polymer was enhanced by the addition of 3rd monomer. The 3rd monomer effect was also observed for the copolymerization system of E and 5-ethylidene-2-norbornene.

Journal

e-Polymersde Gruyter

Published: Dec 1, 2001

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