Ethylene-bridged (4-Substituted Indenyl) (Fluorenyl) Zirconium Complexes: Synthesis and Catalytic Behavior for α-Olefins Polymerization

doi:10.3724/SP.J.1088.2011.01239

Abstract

Abstract: Three new ethylene-bridged (4-substituted indenyl) (fluorenyl) zirconium complexes (2a–2c) were successfully synthesized. They exhibited high isotactic selectivity, which increased with the decrease of polymerization temperature for the polymerization of propylene upon the activation of MAO (methylaluminoxane). Complex 2a with 2-methyl group on indenyl displayed the highest isotactic selectivity of 93.6% at 0 ^oC. At 60 ^oC, complexes 2a–2c reached their optimum catalytic activity, and complex 2a displayed the highest activity of 7.80x10⁶ g PP/(mol-Zr.h). Meanwhile, complexes 2a–2c were also studied for ethylene homopolymerization and linear polyethylenes with broad molecular weight distributions were obtained. Complex 2c with 4-isopropyl substituent on indenyl showed high activity of 3.45x10⁶g PE/(mol-Zr.h) even at a low Al/Zr molar ratio of 500.

Key words: ansa-metallocene, zirconium, polymerization, isotactic polypropylene, polyethylene

HUANG Wenzhong, MA Haiyana, HUANG Jilingb. Ethylene-bridged (4-Substituted Indenyl) (Fluorenyl) Zirconium Complexes: Synthesis and Catalytic Behavior for α-Olefins Polymerization[J]. Chinese Journal of Catalysis, 2011, 32(4): 657-665.

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URL: https://www.cjcatal.com/EN/10.3724/SP.J.1088.2011.01239

https://www.cjcatal.com/EN/Y2011/V32/I4/657

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Ethylene-bridged (4-Substituted Indenyl) (Fluorenyl) Zirconium Complexes: Synthesis and Catalytic Behavior for α-Olefins Polymerization

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