A Study of Copolymerization of 1-Hexene with 2,5-Norbornadiene Using Metallocene Catalysts

Copolymerization of 1‐hexene with a symmetrical diene, namely 2,5‐norbornadiene was studied using four different metallocene catalysts. Copolymerization was found to occur exclusively through one of the two equally reactive endocyclic double bonds with all the four catalysts. Copolymerization result...

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Bibliographic Details
Published in:Macromolecular chemistry and physics 2004-10, Vol.205 (15), p.2055-2063
Main Authors: Yanjarappa, Mallinamadugu J., Sivaram, Swaminathan
Format: Article
Language:English
Subjects:
Applied sciences
chain transfer reactions
Copolymerization
end groups
Exact sciences and technology
metallocene catalysts
Organic polymers
Physicochemistry of polymers
Preparation, kinetics, thermodynamics, mechanism and catalysts
regio errors
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Summary:Copolymerization of 1‐hexene with a symmetrical diene, namely 2,5‐norbornadiene was studied using four different metallocene catalysts. Copolymerization was found to occur exclusively through one of the two equally reactive endocyclic double bonds with all the four catalysts. Copolymerization results in low molecular weight oligomers with the number average molecular weight ($\overline M _{\rm n}$) varying from 1 000–3 000. End group analysis of the co‐oligomers revealed that the β‐hydrogen transfer after 2,1 insertion also occurs in the presence of highly regiospecific catalysts. The regio errors were also found to depend on various reaction parameters such as polymerization time, Al/Zr mol ratio, metallocene concentration and polymerization temperature. Plots of variation in end groups and NBD incorporation with time.
ISSN:1022-1352
1521-3935
DOI:10.1002/macp.200400209