Synthesis of Polyethylene with Bimodal Molecular Weight Distribution by Iron-based Late Transition Metal Catalyst/Various Aluminoxanes System

Abstract

Abstract: A series of alkylaluminoxanes(TEAO, BTEAO, TAAO and BEBAO) were synthesized by hydrolysis of aluminium alkyls and modified with para-fluorophenylboric acid. Their cocatalytic performances, especially their effects on molecular weight and molecular weight distribution of polyethylene catalyzed by {[ArN=C(Me)]₂C₅H₃N}FeCl₂(Ar=2,6-diisopropylphenyl) (1) were studied. Under the action of iron-based catalyst together with all of the four alkylaluminoxanes linear high-density polyethylene with broad or bimodal molecular weight distribution was formed, and the molecular weight and molecular weight distribution of polyethylene could be adjusted to some extent by changing n(Al)/n(Fe) ratios and architecture of aluminoxanes.

Key words: Bimodal molecular weight distribution, Polyethylene, Aluminoxane, Iron-based catalyst

CLC Number:

O632

TrendMD:

LI Li-Dong, WANG Qi, FAN Zhi-Qiang . Synthesis of Polyethylene with Bimodal Molecular Weight Distribution by Iron-based Late Transition Metal Catalyst/Various Aluminoxanes System[J]. Chem. J. Chinese Universities, 2004, 25(9): 1777.

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Synthesis of Polyethylene with Bimodal Molecular Weight Distribution by Iron-based Late Transition Metal Catalyst/Various Aluminoxanes System

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