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6945567 
Journal Article 
Ethylene polymerization with novel bridged tri- and tetranuclear titanocene/MAO systems 
Xiao, X; Sun, J; Li, Xu; Wang, Y; Schumann, H; , 
2007 
Yes 
European Polymer Journal
ISSN: 0014-3057 
PERGAMON-ELSEVIER SCIENCE LTD 
OXFORD 
164-171 
WOS:000244019900018 
Two benzene centered tri- and tetracyclopentadienyl ligands C6H3(CH2C5H5)(3)-1,3,5 (1) and C6H2(CH2C5H5)(4)-12,4,5 (2) and their titanium complexes C6H3[CH2C5H4Ti(C5H5)Cl-2](3)-1,3,5 (3), C6H3[CH2C5H4Ti(C5H4CH3)Cl-2](3)-1,3,5 (4), as well as C6H2[CH2C5H4Ti(C5H5)Cl-2](4)-1,2,4,5 (5) were synthesized and characterized by mass and H-1 NMR spectra. In the presence of methylaluminoxane (MAO), 3, 4 and 5 are efficient catalysts for ethylene polymerization in toluene. The influence of the polymerization conditions such as catalyst concentration, MAO/Ti molar ratio, polymerization time and temperature were investigated in detail. 3, 4 and 5 produce linear polyethylene (PE) with broad molecular weight distributions (MWD) and a little lower molecular weight. (c) 2006 Elsevier Ltd. All rights reserved.