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= HB(3-mesitila-pirazolil) 2 (5-mesitila-pirazolil) foi estudada na presenca do cocatalisador MAO sob varias condicoes de polimerizacao. Todos complexos mostraram-se ativos na polimerizacao do estireno produzindo quase exclusivamente poliestireno atatico. As atividades cataliticas bem como as conversoes com os complexos de niquel foram maiores em relacao aquelas obtidas com os complexos de titânio. Maiores atividades foram encontradas a 80 °C. As propriedades dos poliestirenos sao substancialmente afetadas pelas condicoes de reacao tais como temperatura de polimerizacao, tempo e razao molar [Al]/[M]. Os resultados de GPC mostram que o peso molecular (M w ) dos poliestirenos e sensivel a temperatura de polimerizacao variando de 16.300 a 138.300 g mol -1 . Styrene polymerization with a series of nickel and titanium complexes based on sterically hindered tris(pyrazolyl)borate ligands, Tp Ms = HB(3-mesityl-pyrazolyl) 3 and Tp Ms* = HB(3-mesitylpyrazolyl) 2 (5-mesityl-pyrazolyl) have been studied in the presence of MAO cocatalyst under various polymerization conditions. All complexes showed to be active for styrene polymerization producing almost exclusively atactic polystyrene. The catalytic activities as well as the styrene conversions with nickel complexes were higher than those with the titanium analogues. Higher activities were found at 80 °C. Polystyrene properties are substantially affected by the reaction conditions such as temperature of polymerization, time, and [Al]/[M] molar ratio. The GPC results showed that the molecular weight (M w ) of the polystyrene is sensitive to the temperature of polymerization varying from 16,300 to 138,300 g mol -1

Styrene polymerization by nickel and titanium catalysts based on tris(pyrazolyl)borate ligands