Revista: | Quimica nova |
Base de datos: | PERIÓDICA |
Número de sistema: | 000313258 |
ISSN: | 0100-4042 |
Autores: | Maia, Alessandra de Souza1 Quini, Josue Garcia Miotti, Renata Diana Oliveira, Wanda de |
Instituciones: | 1Universidade de Sao Paulo, Instituto de Quimica, Sao Paulo. Brasil |
Año: | 2006 |
Periodo: | Nov |
Volumen: | 29 |
Número: | 6 |
Paginación: | 1180-1183 |
País: | Brasil |
Idioma: | Portugués |
Tipo de documento: | Artículo |
Enfoque: | Experimental, aplicado |
Resumen en inglés | 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) |
Disciplinas: | Química |
Palabras clave: | Química de polímeros, Catálisis homogénea, Compuestos organolantánidos, Organolantánidos, Olefinas, Polimerización |
Keyword: | Chemistry, Polymer chemistry, Homogeneous catalysis, Organolanthanide compounds, Organolanthanides, Olefins, Polymerization |
Texto completo: | Texto completo (Ver HTML) |