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.
Abstract
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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