https://repositorio.ufba.br/handle/ri/13581
Tipo: | Artigo de Periódico |
Título: | Spectroscopic and voltametric studies in titanium tris(pyrazolyl)borate catalysts |
Título(s) alternativo(s): | Journal of Molecular Catalysis A: Chemical |
Autor(es): | Simplício, Lílian M. T. Rocha, Zênis N. da Gil, Marcelo P. Santos, João Henrique Zimnoch dos Casagrande Junior, O. L. |
Autor(es): | Simplício, Lílian M. T. Rocha, Zênis N. da Gil, Marcelo P. Santos, João Henrique Zimnoch dos Casagrande Junior, O. L. |
Abstract: | The ethylene polymerization using TpMs*TiCl3 (1) (TpMs* = HB(3-mesitylpyrazolyl)2(5-mesitylpyrazolyl)−) and TpMsTiCl3 (2) (TpMs = HB(3-mesityl-pyrazolyl)3−) was performed in toluene or hexane at 60 °C in the presence of MAO or TiBA/MAO (1:1) as cocatalysts. Higher activities were found for the polymerization reactions carried out in hexane, and using a combination of TiBA/MAO as cocatalysts. Absorciometric measurements in the UV–vis region and cyclic voltammetric have shown that such complexes when activated by MAO were not stable. Measurements carried out in the presence 1-hexene have demonstrated the necessity to add the cocatalyst in the presence of an olefin, i.e., ethylene or hexene-1 in order to stabilize the active species. Furthermore, these studies have revealed that after the activation process most of Ti remains as TiIV. |
Palavras-chave: | Titanium Tris(pyrazolyl)borate Polymerization Non-metallocene catalyst |
Tipo de Acesso: | Acesso Aberto |
URI: | http://repositorio.ufba.br/ri/handle/ri/13581 |
Data do documento: | 2005 |
Aparece nas coleções: | Artigo Publicado em Periódico (Química) |
Arquivo | Descrição | Tamanho | Formato | |
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Lílian Simplício.pdf | 309,23 kB | Adobe PDF | Visualizar/Abrir |
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