Ethylene homopolymerization and ethylene/1-hexene copolymerization catalysed by mixed salicylaldiminato cyclopentadienyl zirconium complexes
作者:Wenzhong Huang、Xueqin Sun、Haiyan Ma、Jiling Huang
DOI:10.1016/j.ica.2009.06.010
日期:2010.6
Three new mixed salicylaldiminato cyclopentadienyl zirconium complexes Cp'[2-Bu(t)-6-(C(6)H(11)NCH) C(6)H(3)O]ZrCl(2) (Cp' = (n)BuC(5)H(4) (3a), (t)BuC(5)H(4) (3b) and Me(4)C(5)H (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 x 10(6) g PE/mol Zr h for ethylene homopolymerization at 70 degrees C. The (13)C 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 x 10(5) to 12.3 x 10(5) 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. (C) 2009 Elsevier B.V. All rights reserved.