Effect of textural characteristics of supported metallocenes on ethylene polymerization

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

Effect of textural characteristics of supported metallocenes on ethylene polymerization

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dc.contributor.author	Silveira, Fernando
dc.contributor.author	Brambilla, Rodrigo
dc.contributor.author	Silveira, Nadya Pesce da
dc.contributor.author	Alves, Maria do Carmo Martins
dc.contributor.author	Stedile, Fernanda C.
dc.contributor.author	Pergher, Sibele Berenice Castellã
dc.contributor.author	Santos, João Henrique Zimnoch dos
dc.date.accessioned	2020-06-03T01:54:30Z
dc.date.available	2020-06-03T01:54:30Z
dc.date.issued	2010-01-06
dc.description.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.	pt_BR
dc.identifier.citation	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.	pt_BR
dc.identifier.doi	10.1007/s10853-009-4153-9
dc.identifier.issn	1573-4803
dc.identifier.uri	https://repositorio.ufrn.br/jspui/handle/123456789/29121
dc.language	en	pt_BR
dc.publisher	Springer	pt_BR
dc.rights	Attribution-NonCommercial-NoDerivs 3.0 Brazil	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/br/	*
dc.subject	Secondary Particle	pt_BR
dc.subject	Chrysotile	pt_BR
dc.subject	Ethylene Polymerization	pt_BR
dc.subject	Cp2ZrCl2	pt_BR
dc.subject	Commercial Silica	pt_BR
dc.title	Effect of textural characteristics of supported metallocenes on ethylene polymerization	pt_BR
dc.type	article	pt_BR