Ethylene homopolymerization and ethylene/1-hexene copolymerization catalysed by mixed salicylaldiminato cyclopentadienyl zirconium complexes

Three new mixed salicylaldiminato cyclopentadienyl zirconium complexes Cp′[2-But-6-(C6H11NCH)C6H3O]ZrCl2 (Cp′ = nBuC5H4 (3a), tBuC5H4 (3b) and Me4C5H (3c)) were prepared and the structure of complex 3c was confirmed by X-ray diffraction analysis. All of the three complexes showed high activities for ethylene homopolymerization with the activation of methylaluminoxane, and 3a showed the highest activity up to 1.15 × 106 g PE/mol Zr h for ethylene homopolymerization at 70 °C. The 13C NMR spectrum showed that the obtained polymer is linear polyethylene. Complexes 3a–c also catalysed ethylene/1-hexene copolymerization with high activities from 6.29 × 105 to 12.3 × 105 g Copolymer/mol Zr h and with 0.89–1.39% 1-hexene incorporation level. In addition, the influence of the substituted alkyl on Cp on the catalytic behavior of corresponding zirconium complexes was discussed.

Three new mixed salicylaldiminato cyclopentadienyl zirconium complexes Cp′[2-But-6-(C6H11NCH)C6H3O]ZrCl2 (Cp′ = nBuC5H4 (3a), tBuC5H4 (3b) and Me4C5H (3c)) were prepared and showed high activities for ethylene polymerization and ethylene/1-hexene copolymerization with the activation of MAO.Figure optionsDownload as PowerPoint slide