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Ethylene Polymerization with Cycloalkylidene-Bridged Cyclopentadienyl Metallocene Catalysts

Shansheng Xu, Xiaobin Deng, Baiquan Wang, Xiuzhong Zhou, Ling Yang, Yufei Li, Youliang Hu, Fenglou Zou, Yang Li

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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.

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What this paper is about

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.

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OpenAlex reports 12 citations for this work. Citation counts describe recorded attention and do not establish research quality.

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Available 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.

Key concepts: Cyclopentadienyl complex, Metallocene, Ethylene, Catalysis, Polymerization, Post-metallocene catalyst, Polymer chemistry, Chemistry

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