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Effect of cocatalysts on the performance of three post-metallocene catalysts based on complexes I–III in Scheme 1 is studied by comparing their activity in the presence of two cocatalysts, MAO and a combination of AlEt 2 Cl and MgBu 2 , in propylene polymerization reactions. The second cocatalyst produces significantly more active catalysts. Analysis of GPC, DSC and 13 C NMR...