Synthesis and Evaluation of New Bis(imino) Pyridine Based Catalysts for Ethylene Polymerization

Authors:

Suellem Cordeiro, Leticia Pereira, Marina de O. Simoes and Maria de Fatima Marques

Universidade Federal do Rio de Janeiro, Instituto de Macromoleculas Eloisa Mano IMA-UFRJ, Cidade Universitaria. Av. Horacio Macedo, 2.030 Centro de Tecnologia, Bloco J. Rio de Janeiro, RJ. Brasil; fmarques@ima.ufrj.br

Three-component catalytic systems based on 2,6-bis(imino) pyridine iron(II) chloride were synthesized from different ligands, which provided new alternative catalysts for polymerization of ethylene. The synthesized catalysts were characterized by Fourier transform infrared spectroscopy (FTIR), and the lack of absorption bands was observed in the region related to the carbonyl, as well as the presence of bands in the region of imino groups corresponding to C=N bonds. Coordination with Fe was also carried out. The structure of the ligands and the new catalysts were confirmed by the elemental analysis (CHN), and 1H- and 13C-nuclear magnetic resonance spectroscopy. In ethylene polymerization with methylaluminoxane as a cocatalyst, the activity of catalyst C1 was high. Although this catalyst structure contains sterically bulky ligands, the metal center was not sufficiently protected allowing transfer reactions, producing polyethylene with a low molar mass and melting temperature.

post-metallocene catalysts

bis(imino) pyridine ligands

ethylene polymerization.

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