Polimerização de estireno utilizando compostos organolantanídeos ativados por MAO

Química Nova

Alessandra De Souza Maia¹  Josué Garcia Quini¹  Renata Diana Miotti¹  Wanda De Oliveira¹ 

[1] ,Universidade de São Paulo Instituto de Química São Paulo SP ,Brasil

关键词: organolanthanide compounds;    homogeneous catalysis;    olefin polymerization;   

DOI  :  10.1590/S0100-40422006000600006

来源: SciELO

【 摘 要 】

In an attempt to improve the performance of organolanthanide catalysts we investigated the use of the industrially important cocatalyst methylaluminoxane (MAO) to activate organolanthanide compounds in olefin polymerization. The catalytic systems LnBrCp2(THF)2/MAO (Cp=cyclopentadienyl) and LnBrCp*2THF/MAO (Cp*= pentamethylcyclopentadienyl), Ln=Pr and Yb, were active in styrene polymerization but inactive in ethylene and propylene polymerization. These systems produced atactic polystyrene with conversions of up to 8.2% (PrBrCp*2THF, Al/Ln=200, T=80ºC, t=4 h) in toluene. In the absence of solvent, the conversion is 26.0% (1.5 h) and the molar mass of the atactic polystyrene is almost ten times higher (43 kg/mol).

【 授权许可】

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