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Copolymerization of ethylene with 2,5-norbornadiene using a homogeneous metallocene/MAO catalyst system

✍ Scribed by K. Radhakrishnan; S. Sivaram

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 62 KB
Volume: 200
Category: Article
ISSN: 1022-1352
DOI: 10.1002/(sici)1521-3935(19990401)200:4<858::aid-macp858>3.0.co;2-7

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✦ Synopsis

Copolymerization of ethylene with a symmetrical diene, namely, 2,5-norbornadiene was studied using a homogeneous metallocene/MAO catalyst system. Copolymerizations were found to occur exclusively through one of the two equally reactive endocyclic double bonds with Cp 2 ZrCl 2 , (buCp) 2 ZrCl 2 and Et(Ind) 2 ZrCl 2 catalysts. Both double bonds are involved in the polymerization when Me 2 SiCp 2 ZrCl 2 is used as the catalyst. In the case of Et(Ind) 2 ZrCl 2 , the incorporation of the diene was found to increase with time. The extent of incorporation of the diene, molecular weight and copolymerization activity were found to depend on the nature of the catalyst.

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