期刊论文详细信息
Química Nova
Styrene polymerization using organolanthanide compounds activated by MAO
Miotti, Renata Diana1  Maia, Alessandra de Souza1  Universidade de São Paulo, São Paulo, Brasil1  Quini, Josué Garcia1  Oliveira, Wanda de1 
关键词: organolanthanide compounds;    homogeneous catalysis;    olefin polymerization.;   
DOI  :  10.1590/S0100-40422006000600006
学科分类:化学(综合)
来源: Sociedade Brasileira de Quimica
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【 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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