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Title: Effect of textural characteristics of supported metallocenes on ethylene polymerization
Authors: 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
Keywords: Secondary Particle;Chrysotile;Ethylene Polymerization;Cp2ZrCl2;Commercial Silica
Issue Date: 6-Jan-2010
Publisher: Springer
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 Disponível em: Acesso em: 16 maio 2020.
Portuguese Abstract: 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.
ISSN: 1573-4803
Appears in Collections:IQ - Artigos publicados em periódicos

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