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An explanation for experimental behavior of hybrid metallocene silica-supported catalyst for ethylene polymerization

Aguiao Rodrigues, Silvia et al · Elsevier Science · 2004

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Author / responsible party
Aguiao Rodrigues, Silvia et al
Publisher
Elsevier Science
Year
2004
ISSN
1381-1169
ISSN
1381-1169
Language
English

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This work presents the results of homopolymerization of ethylene using an hybrid system (nBuCp)2ZrCl2-Cp2ZrCl 2, supported on silica. The catalytic systems were analyzed by RBS, DRIFTS and EXAFS and polyethylenes (PE) by GPC and DSC. The catalytic activities and the polymer properties showed dependence on the different ratio used (nBuCp)2ZrCl2/Cp2ZrCl2 at the preparation step. Theoretical studies permit us to conclude that the metallocenes interact with the surface in different ways. Depending on the addition order and the molar ratio between both metallocenes, distribution and nature of active species would be different. Possibility of binuclear active sites with different propagation and termination constants is analyzed and discussed. EHMO calculations allow us to conclude that Cp2ZrCl 2 has a strong affinity by AIS plane, whereas (nBuCp) 2ZrCl2 shows similar affinity for both silica planes. Fil: Aguiao Rodrigues, Silvia. Universidade Federal do Rio Grande do Sul; Brasil Fil: Silveira, Fernando. Universidade Federal do Rio Grande do Sul; Brasil

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APA 7

Aguiao Rodrigues, S. E. A. (2004). An explanation for experimental behavior of hybrid metallocene silica-supported catalyst for ethylene polymerization. http://hdl.handle.net/11336/97832

MLA

Aguiao Rodrigues, Silvia et al. "An explanation for experimental behavior of hybrid metallocene silica-supported catalyst for ethylene polymerization." 2004. http://hdl.handle.net/11336/97832.

Chicago

Aguiao Rodrigues, Silvia et al. 2004. "An explanation for experimental behavior of hybrid metallocene silica-supported catalyst for ethylene polymerization.". http://hdl.handle.net/11336/97832.

Harvard

Aguiao Rodrigues, S. E. A. 2004, An explanation for experimental behavior of hybrid metallocene silica-supported catalyst for ethylene polymerization, Elsevier Science, available at: http://hdl.handle.net/11336/97832 [Accessed 5 Aug. 2026].

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Title
An explanation for experimental behavior of hybrid metallocene silica-supported catalyst for ethylene polymerization
Author / contributors
Aguiao Rodrigues, Silvia et al
Publisher
Elsevier Science
Publication year
2004
ISSN
1381-1169
ISSN
1381-1169
Language
English

Subjects

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SUPPORTED METALLOCENES; THEORETICAL CHARACTERIZATION; ZIRCONOCENE; https://purl.org/becyt/ford/2.4; https://purl.org/becyt/ford/2
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