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Copolymerization of ethylene with 2,5‐norbornadiene using a homogeneous metallocene/MAO catalyst system
Author(s) -
Radhakrishnan K.,
Sivaram S.
Publication year - 1999
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/(sici)1521-3935(19990401)200:4<858::aid-macp858>3.0.co;2-7
Subject(s) - metallocene , norbornadiene , copolymer , diene , ethylene , polymer chemistry , catalysis , homogeneous , polymerization , chemistry , double bond , norbornene , homogeneous catalysis , post metallocene catalyst , organic chemistry , polymer , physics , thermodynamics , natural rubber
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.