TY - JOUR
T1 - Copolymerization of ethylene and cyclopentene with zirconocene catalysts
T2 - Effect of ligand structure of zirconocenes
AU - Naga, Naofumi
AU - Imanishi, Yukio
PY - 2002/1/9
Y1 - 2002/1/9
N2 - Copolymerization of ethylene and cyclopentene (CPE) was carried out with various non-bridge 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)2ZrCl2] gave copolymers containing the highest amount of CPE units by 1,2-insertion of 1,3-insertion. Temperature-rising elution fractionation of the copolymers using 1,2-dichlorobenzene as a solvent showed a broad distribution of copolymer composition in copolymers obtained by specific zirconocene catalysts.
AB - Copolymerization of ethylene and cyclopentene (CPE) was carried out with various non-bridge 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)2ZrCl2] gave copolymers containing the highest amount of CPE units by 1,2-insertion of 1,3-insertion. Temperature-rising elution fractionation of the copolymers using 1,2-dichlorobenzene as a solvent showed a broad distribution of copolymer composition in copolymers obtained by specific zirconocene catalysts.
KW - Copolymerization
KW - Cyclopentene
KW - Effect of ligand
KW - Ethylene
KW - Zirconocene catalyst
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U2 - 10.1002/1521-3935(20020101)203:1<159::AID-MACP159>3.0.CO;2-0
DO - 10.1002/1521-3935(20020101)203:1<159::AID-MACP159>3.0.CO;2-0
M3 - Article
AN - SCOPUS:0037045461
VL - 203
SP - 159
EP - 165
JO - Macromolecular Chemistry and Physics
JF - Macromolecular Chemistry and Physics
SN - 1022-1352
IS - 1
ER -