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https://repositorio.ufrn.br/handle/123456789/29121| Título: | Effect of textural characteristics of supported metallocenes on ethylene polymerization |
| Autor(es): | Silveira, Fernando Brambilla, Rodrigo Silveira, Nadya Pesce da Alves, Maria do Carmo Martins Stedile, Fernanda C. Pergher, Sibele Berenice Castellã Santos, João Henrique Zimnoch dos |
| Palavras-chave: | Secondary Particle;Chrysotile;Ethylene Polymerization;Cp2ZrCl2;Commercial Silica |
| Data do documento: | 6-Jan-2010 |
| Editor: | Springer |
| Referência: | SILVEIRA, Fernando; BRAMBILLA, Rodrigo; SILVEIRA, Nadya Pesce da; ALVES, Maria do Carmo Martins; STEDILE, Fernanda C.; PERGHER, Sibele B. C.; SANTOS, João Henrique Zimnoch dos. Effect of textural characteristics of supported metallocenes on ethylene polymerization. Journal Of Materials Science, [s. l.], v. 45, n. 7, p. 1760-1768, 6 jan. 2010. ISSN 1573-4803. DOI https://doi.org/10.1007/s10853-009-4153-9. Disponível em: https://link.springer.com/article/10.1007%2Fs10853-009-4153-9. Acesso em: 16 maio 2020. |
| Resumo: | Catalyst particle size is an important parameter in the polymer industry. A series of supports with different textural properties (silicas prepared by different routes), surface sites (alumino-silicate, silica-zirconia, magnesia-silica supports, and methylaluminoxane-modified silica) and crystallinity (amorphous, lamellar, and crystalline materials) were investigated in the sequential grafting reaction of two metallocene catalysts, Cp2ZrCl2 and (n-BuCp)2ZrCl2, in a 1:3 ratio. The catalyst systems were analyzed by Rutherford backscattering spectrometry, atomic force microscopy, small angle X-ray scattering, extended X-ray absorption fine structure spectroscopy, and nitrogen adsorption. All of the systems were shown to actively polymerize ethylene when methylaluminoxane was used as the cocatalyst. Experimental results are discussed in terms of the relationships between the radius of gyration of secondary particles and catalyst activity. A radius of gyration in the range of 8–9 nm was shown to be associated with higher catalyst activity. |
| URI: | https://repositorio.ufrn.br/jspui/handle/123456789/29121 |
| ISSN: | 1573-4803 |
| Aparece nas coleções: | IQ - Artigos publicados em periódicos |
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| EffectTexturalCharacteristics_Pergher_2010.pdf | 561,6 kB | Adobe PDF |  Visualizar/Abrir |
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