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