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- W2079143788 abstract "Abstract Three fluorinated bis(phenoxy-imine)titanium complexes bearing ortho -halide substituents on the phenoxy rings [Cl ( 1 ), Br ( 2 ), I ( 3 )] were synthesized, characterized and evaluated as precatalysts for the polymerization of ethylene in conjunction with methylaluminoxane (MAO) under atmospheric pressure. These C 2 -symmetric catalysts exhibit high activity toward ethylene polymerization and produce ultra high molecular weight polyethylene (UHMWPE) ( M W > 3,000,000). The living polymerization was presented as evidenced by the narrow molecular weight distribution. The living nature of these catalysts is attributed to the interaction of a fluorine atom adjacent to the imine nitrogen and a β-hydrogen of a polymer chain resulting in the suppression of β-hydrogen transfer. The highest activity at 11.65 kg PE/mmol cat h was observed for the polymerization using complex 2 . In comparison with complex 1 , the more bulky bromo substituents can induce an effective ion-pair separation between the cationic active species and an anionic cocatalyst yielding a higher polymerization rate. However, in case of complex 3 with iodo substituents, the enhancement of the steric congestion at the metal center results in the decreased polymerization activity." @default.
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- W2079143788 date "2013-06-01" @default.
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- W2079143788 title "Fluorinated bis(phenoxy-imine)titanium complexes with methylaluminoxane for the synthesis of ultra high molecular weight polyethylene" @default.
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- W2079143788 doi "https://doi.org/10.1016/j.polymer.2013.04.060" @default.
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