1-Hexene polymerization by Cp*TiX2(O-2,6-iPr2C6H3) [X: Cl, Me] in the presence of MAO- and MMAO-modified carbonaceous supports

Various MAO-. MMAO-modified carbonaceous materials with different degrees of coalification, surface areas and amounts of nitrogen in their structures have been prepared, and the nature of AI supported and their compositions of elements close to surface were determined by the XPS method. These materials were effective as supported cocatalysts in 1-hexene polymerization using Cp*TiX2(O-2,6-(Pr2CCH3)-Pr-i) [X = Cl (1), Me (2)], affording poly(1-hexene)s with unimodal molecular weight distributions; the facts clearly suggest that these polymerizations proceeded with uniform (single-site) catalytically active species. The activities were affected by the nature of the carbonaceous supports employed, whereas the surface area does not strongly affect the activity in this catalysis. (C) 2009 Elsevier B.V. All rights reserved.