Health & Environmental Research Online (HERO)


Print Feedback Export to File
5247890 
Journal Article 
Copolymerization of ethylene and cyclopentene with zirconocene catalysts: Effect of ligand structure of zirconocenes 
Naga, N; Imanishi, Y 
2002 
1 
Macromolecular Chemistry and Physics
ISSN: 1022-1352 
203 
1 
159-165 
English 
WOS:000173697900022 
Copolymerization of ethylene and cyclopentene (CPE) was carried out with various non-bridged and bridged zirconocene catalysts using methylaluminoxane as a cocatalyst. Non-bridged metallocene catalysts effected ethylene homopolymerization without copolymerization. On the other hand, bridged zirconocene catalysts produced copolymers containing cis-1,2-cyclopentane units. Among the used catalysts, rac-ethylenebis(indenyl) zirconium dichloride [Et(Ind)(2)ZrCl(2)] gave copolymers containing the highest amount of CPE units by 1,2-insertion or 1,3-insertion. Temperature-rising elution fractionation of the copolymers using 1,2-dichlorobenzene as solvent showed a broad distribution of copolymer composition in copolymers obtained by specific zirconocene catalysts. 
Polymer Science; copolymerization, cyclopentene, effect of ligand, ethylene, zirconocene; catalyst; ethene-norbornene copolymerization, half-sandwich catalysts,; ziegler-natta catalysts, metallocene-catalysts,; methylaluminoxane-catalysts, olefin polymerization, homogenous; metallocene, reaction equilibria, crystal-structure, microstructure