Abstract
Ethylene polymerization with linked amido-cyclopentadienyl or “constrained-geometry” titanium catalysts, Ti(η5:η1-C5Me4SiMe2NtBu)X2 (X=Me, Bz, Cl), activated by tritylpyridinium tetrakis(entafluorophenyl)borate, [Ph3C(NC5H5)] [B(C6F5)4], and silica-supported tritylpyridinium tetrakis(entafluorophenyl)borate (PySTB) was found to proceed with high activity. 1H NMR spectra in CD2Cl2 suggest that ([Ti(η5:η1-C5Me4,SiMe2NtBu)Me (NC5H5)]+ is formed as the main cationic species. Using the heterogeneous cocatalyst PySTB in hexane, unexpectedly high ethylene polymerization activity was achieved, giving high molecular weight polyethylenes with excellent morphology and high bulk density (up to 0.46 g/cm3).
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