Abstract
The mechanism of formation of branched polyethylene in the polymerization promoted by meso-metallocene/MAO systems has been investigated by combining DFT calculations and experimental results on differently featured meso-zirconocenes. A possible explanation for the required meso structure in the formation of branches considers a competition of ethene insertion and β-hydrogen transfer to the monomer. General mechanistic considerations in order to design catalytic systems able to synthesize LLDPE by ethene homopolymerization have been outlined.
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