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New Journal of Chemistry.... the home of new and emerging multidisciplinary work in the chemical sciences.
Paper
New J. Chem., 2002, 26, 1485 - 1489, DOI: 10.1039/b202715c
Polymer-incorporated iron catalysts for ethylene polymerization—a new approach to immobilize iron olefin catalysts on polystyrene chains
Changkun Liu and Guoxin Jin
2,6-Bis(imino)pyridyl iron catalysts bearing allyl groups [ArN
C(Me)][Ar
NC(Me)]C5H3NFeCl2(Ar
=Ar=4-allyl-2,6-(i-Pr)2C6H2(Cat-1); Ar=2,6-(i-Pr)2C6H3, Ar=4-allyl-2,6-(i-Pr)2C6H3(Cat-2)) have been synthesized and characterized. The corresponding polymer-incorporated iron catalysts PC-1, PC-2 and their SiO2-supported core–shell structure catalysts SC-1 and SC-2 were obtained by the co-polymerization of the olefin groups of Cat-1 or Cat-2 with styrene in the presence of a radical initiator. All three types of catalysts (Cat-1 and Cat-2; PC-1 and PC-2; SC-1 and SC-2) have been investigated for ethylene polymerization. As a result, these catalysts were found to exhibit high activity using modified methylaluminoxane (MMAO) as a co-catalyst. Among them, the polymer-incorporated SiO2 core–shell catalysts displayed very high activity (
3181 g (mmol Fe)–1 h–1) with product molecular weights in the range 25–93×104. The particle morphology of polyethylene produced by the core–shell structure catalysts (SC-1 and SC-2) was improved.
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