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https://repositorio.ufba.br/handle/ri/7229
metadata.dc.type: | Artigo de Periódico |
Title: | Study of some parameters on the zirconocene immobilization over silica |
Other Titles: | Journal of Molecular Catalysis A: Chemical |
Authors: | Simplício, Lílian Maria Tosta Costa, Fábio Gomes Boaventura Filho, Jaime Soares Sales, Emerson Andrade Brandão, Soraia Teixeira |
metadata.dc.creator: | Simplício, Lílian Maria Tosta Costa, Fábio Gomes Boaventura Filho, Jaime Soares Sales, Emerson Andrade Brandão, Soraia Teixeira |
Abstract: | This work presents a 23-1 factorial planning designed to evaluate the effect of some parameters of the metallocene immobilization route in the ethylene polymerization. The highest ethylene polymerization activity was observed for the catalyst synthesized using TMA as modifier agent, in the inverse addition order, and impregnation temperature of 60 ◦C. These results indicated that the immobilization route played an important role on the catalysts performance. UV-Vis DRS results suggested the formation of MAO-like species on the silica surface. These species may be formed from the reaction of TMA either with water adsorbed on the support or OH groups of the silica surface. DSC analyses indicated that the crystallinity of these polymers varied as a function of the catalytic activity, the more active catalysts producing polymers with higher crystallinity. The obtained polymers presented melting point around 133 ◦C, typical of commercial polyethylene. |
Keywords: | Supported zirconocene Polymerization Ethylene |
Publisher: | Elsevier |
URI: | http://www.repositorio.ufba.br/ri/handle/ri/7229 |
Issue Date: | 2004 |
Appears in Collections: | Artigo Publicado em Periódico (Química) |
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File | Description | Size | Format | |
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CONFIG~1....0-S138111690400086X-main.pdf Restricted Access | 209,25 kB | Adobe PDF | View/Open Request a copy |
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