Propylene Polymerization Catalyzed by Bis (R3-indenyl) Zirconium Dichloride/Aluminoxane--Synthesis of Metallocenes and Influence of Sol vent Polarity on Poi ymerization

Chemical Research in Chinese Universities ›› 2001, Vol. 17 ›› Issue (4): 445-451.

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Propylene Polymerization Catalyzed by Bis (R3-indenyl) Zirconium Dichloride/Aluminoxane--Synthesis of Metallocenes and Influence of Sol vent Polarity on Poi ymerization

YASIN Tariq, FAN Zhi-qiang, ZHU Yin-bang, FENG Lin-xian

Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China

Received:2000-08-29 Online:2001-12-24 Published:2011-08-04
Supported by:
Supported by the National Natural Science Foundation of China and SINOPEC(No.29734144).

Abstract

Abstract: Three unbridged metallocenes, bis(2,4,7-Mea-indenyl)zirconium dichloride (1), bis (2-Me4,7-Etz-indenyl) zirconium dichloride (2) and bis (2,4,6-Me3-indenyl) zirconium dichloride (3)were synthesized.The effect of solvent polarity on propylene polymerization catalyzed by the metallocenes in the presence of methylaluminoxane(MAO) and triisobutylaluminum(TIBA) was investigated in the toluene/CH₂Cl₂ mixed solvent.Changing the solvent polarity was found to influence the catalytic activity, polymer molecular weight and stereospecificity of the catalysts.The changes in the position of the substituents on the ligand caused the different responses of the catalyst to the changes in solvent polarity.The isotactic stereosequence of polypropylene was found to increase with the increase in the polarity of the reaction medium.

Key words: Propylene polymerization, Metallocene catalyst, Solvent effect, Polarity

YASIN Tariq, FAN Zhi-qiang, ZHU Yin-bang, FENG Lin-xian. Propylene Polymerization Catalyzed by Bis (R3-indenyl) Zirconium Dichloride/Aluminoxane--Synthesis of Metallocenes and Influence of Sol vent Polarity on Poi ymerization[J]. Chemical Research in Chinese Universities, 2001, 17(4): 445-451.

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Propylene Polymerization Catalyzed by Bis (R3-indenyl) Zirconium Dichloride/Aluminoxane--Synthesis of Metallocenes and Influence of Sol vent Polarity on Poi ymerization

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