Polymer-incorporated iron catalysts for ethylene polymerization—a new approach to immobilize iron olefin catalysts on polystyrene chains

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Abstract
2,6-Bis(imino)pyridyl iron catalysts bearing allyl groups [ArNC(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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