Citation: . THE BEHAVIOR OF HOMOGENEOUS IRON-BASED CATALYSTS BEARING PYRIDINE DIIMINE LIGANDS FOR ETHYLENE POLYMERIZATION*[J]. Chinese Journal of Polymer Science, ;2000, 18(6): 509-513. shu

THE BEHAVIOR OF HOMOGENEOUS IRON-BASED CATALYSTS BEARING PYRIDINE DIIMINE LIGANDS FOR ETHYLENE POLYMERIZATION*

Received Date: 6 January 2000

The polymerization of ethylene by two iron-based catalysts, {[2,6-ArN=C(Me)2C5H3N]FeCl2} (Ar=2,6-C6H3-Me21; 2,6-C6Hv3 (i-Pr)v2 Ⅱ) has been investigated. Catalyst Ⅱ produces higher molecular weight polyethylene (PE) and broadenedpolydispersities relative to catalyst Ⅰ under analogous conditions and all polymers are linear. The kinetic profiles with ironcatalysts showed a smooth pattern during both rate build-up and rate lowering, which are different from the metallocene catalysts. The polymerization activity increases with Al/Fe value and an optimum temperature range at 40～50℃ was observed.The molecular weight of PE decreases with the increase of Al/Fe ratio and rise of polymerization temperature.
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