Polyethylene/Clay Nanocomposites Made with Metallocenes Supported on Different Organoclays

The success of in situ polymerizations, measured by means of high polymerization activity, uniform exfoliation and clay dispersion in the polymer matrix, and good powder morphology, depends on how well the catalyst is supported onto the clay surface. A novel catalyst supporting method that does not...

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Bibliographic Details
Published in:Macromolecular chemistry and physics 2011-02, Vol.212 (3), p.216-228
Main Authors: Maneshi, Abolfazl, Soares, João B.P., Simon, Leonardo C.
Format: Article
Language:English
Subjects:
Applied sciences
Catalysts
Clay (material)
Cloisites
Composites
Dispersions
Ethylene
Exact sciences and technology
Exfoliation
Forms of application and semi-finished materials
in situ polymerization
Morphology
Nanocomposites
Organic polymers
organically modified clays
Physicochemistry of polymers
polyethylene/clay nanocomposites
Polymer industry, paints, wood
Polymerization
Preparation, kinetics, thermodynamics, mechanism and catalysts
Technology of polymers
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Summary:The success of in situ polymerizations, measured by means of high polymerization activity, uniform exfoliation and clay dispersion in the polymer matrix, and good powder morphology, depends on how well the catalyst is supported onto the clay surface. A novel catalyst supporting method that does not require the addition of methylaluminoxane was applied to different organically modified clays and sodium montmorillonite. The supported catalysts were used to polymerize ethylene. We found out that only the clay modified with tertiary ammonium salts was an effective support for ethylene polymerization, generating a supported catalyst that has high polymerization activity, and produces nanocomposites with good powder morphology and excellent clay exfoliation. Six different types of commercial organoclays were evaluated as supports for Cp2ZrCl2 for use in polyethylene/clay nanocomposite production in a slurry reactor using a supporting procedure that did not require the use of MAOs. Only the organoclay modified with a tertiary ammonium cation was an efficient catalyst support for Cp2ZrCl2. In situ polymerization with this supported catalyst had high activity and made nanocomposites with excellent clay exfoliation and dispersion in the polyethylene matrix.
ISSN:1022-1352
1521-3935
1521-3935
DOI:10.1002/macp.201000432