Styrene polymerization using organolanthanide compounds activated by MAO

Quimica nova

Miotti, Renata Diana¹  Maia, Alessandra de Souza¹  Quini, Josué Garcia¹  Oliveira, Wanda de¹ 

[1] Universidade de São Paulo, São Paulo, Brasil

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

【 摘 要 】

In an attempt to improve the performance of organolanthanide catalysts we investigatedthe use of the industrially important cocatalyst methylaluminoxane (MAO) toactivate organolanthanide compounds in olefin polymerization. The catalyticsystems LnBrCp2(THF)2/MAO (Cp=cyclopentadienyl) and LnBrCp*2THF/MAO(Cp*= pentamethylcyclopentadienyl), Ln=Pr and Yb, were active in styrene polymerizationbut inactive in ethylene and propylene polymerization. These systems producedatactic 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 polystyreneis almost ten times higher (43 kg/mol).

【 授权许可】

CC BY