Abstract
Ethylene was polymerized with cycloalkylidene-bridged cyclopentadienyl metallocene catalyst 1-9 in the presence of methyl aluminoxane (MAO) as the cocatalyst. Unlike the normal titanocene catalyst, the cycloalkylidene-bridge cyclopentadienyl titanocene catalyst show much higher activities than the corresponding zirconocene and hafnocene catalysts and show the highest activities at higher temperature. This indicates that the cycloalkylidene-bridge cyclopentadienyl titanocene system is very thermally stable and maybe a very promising catalyst system for industrial apllication.
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