| Journal: | Quimica nova |
| Database: | PERIÓDICA |
| System number: | 000313258 |
| ISSN: | 0100-4042 |
| Authors: | Maia, Alessandra de Souza1 Quini, Josue Garcia Miotti, Renata Diana Oliveira, Wanda de |
| Institutions: | 1Universidade de Sao Paulo, Instituto de Quimica, Sao Paulo. Brasil |
| Year: | 2006 |
| Season: | Nov |
| Volumen: | 29 |
| Number: | 6 |
| Pages: | 1180-1183 |
| Country: | Brasil |
| Language: | Portugués |
| Document type: | Artículo |
| Approach: | Experimental, aplicado |
| English abstract | 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) |
| Disciplines: | Química |
| Keyword: | Química de polímeros, Catálisis homogénea, Compuestos organolantánidos, Organolantánidos, Olefinas, Polimerización |
| Keyword: | Chemistry, Polymer chemistry, Homogeneous catalysis, Organolanthanide compounds, Organolanthanides, Olefins, Polymerization |
| Full text: | Texto completo (Ver HTML) |
