Abstract
Ethylene-norbornene copolymerization was investigated by using metallocene catalysts, [2,2′-methylenebis( 1,3-dimethylcyclopentadienyl)]zirconium dichloride(2,2′-CH2 (1,3-Me2Cp)2ZrCl2, Catalyst A) and racemicethylenebis( indenly)zirconium dichloride (rac-Et(Ind)2 ZrCl2, Catalyst B), in the presence of methylaluminoxane as a cocatalyst. The influences of different process parameters such as polymerization temperature and ethylene pressure were studied by using a 56 wt% norbornene solution in toluene. The results show that Catalyst A has a higher activity in copolymerization than Catalyst B. Catalyst A also has a superior norbornene insertion performance to Catalyst B, resulting in polymers with higher glass transition temperatures, by approximately 70 ‡C, at similar polymerization conditions, indicative of a great commercial potential of Catalyst A.
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Jeong, BG., Nam, DW., Hong, SD. et al. Influence of process parameters on ethylene-norbornene copolymers made by using [2,2′-methylenebis(1,3-dimethylcyclopentadienyl)]-zirconium dichloride and MAO. Korean J. Chem. Eng. 20, 22–26 (2003). https://doi.org/10.1007/BF02697179
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DOI: https://doi.org/10.1007/BF02697179