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Supported hybrid catalysts based on zirconocene and tris(pyrazolyl)borate titanium derivatives
Journal of applied polymer science, 2006-03, Vol.99 (5), p.2002-2009
Pires, Gilvan P.
Gil, Marcelo P.
Rohrman, Juliana A.
Stedile, Fernanda C.
Casagrande Jr, Osvaldo L.
dos Santos, João H. Z.
Sano, Tsuneji
2006
Details
Autor(en) / Beteiligte
Pires, Gilvan P.
Gil, Marcelo P.
Rohrman, Juliana A.
Stedile, Fernanda C.
Casagrande Jr, Osvaldo L.
dos Santos, João H. Z.
Sano, Tsuneji
Titel
Supported hybrid catalysts based on zirconocene and tris(pyrazolyl)borate titanium derivatives
Ist Teil von
Journal of applied polymer science, 2006-03, Vol.99 (5), p.2002-2009
Ort / Verlag
Hoboken: Wiley Subscription Services, Inc., A Wiley Company
Erscheinungsjahr
2006
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
A series of hybrid supported catalysts were prepared by combining (iBuCp)2ZrCl2 and {TpMs*}TiCl3 complex (TpMs* = HB(3‐mesityl‐pyrazolyl)2(5‐mesityl‐pyrazolyl)−) sequentially grafted onto MAO (methylaluminoxane)‐modified silica according to a Plackett Burmann 23 design. Supported catalysts were prepared taking into account the immobilization order, silica pretreatment temperature, and grafting temperature. Grafted metal content was comparatively determined by Rutherford backscattering spectrometry (RBS), X‐ray photoelectronic spectroscopy (XPS), and inductively coupled plasma–optical emission spectroscopy (ICP–OES). The resulting catalysts were evaluated in terms of catalyst activity and polymer properties. According to RBS measurements, grafted metal content remained comprised between 0.1 and 0.5 wt % Zr/SiO2 and 0.1 and 0.3 wt % Ti/SiO2 depending on the immobilization order and on silica pretreatment temperature. All the systems were shown to be active in ethylene polymerization having external MAO as cocatalyst. Catalyst activity seemed to be governed by the zirconocene species, influenced slightly by Ti ones. Resulting polymers were characterized by DSC and GPC. The polyethylenes mostly presented higher molecular weight than those produced by homogeneous catalysts or by zirconocene grafted on bare or on MAO‐modified silica. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci, 2006
Sprache
Englisch
Identifikatoren
ISSN: 0021-8995
eISSN: 1097-4628
DOI: 10.1002/app.22014
Titel-ID: cdi_crossref_primary_10_1002_app_22014
Format
–
Schlagworte
Applied sciences
,
ethylene polymerization
,
Exact sciences and technology
,
hybrid catalysts
,
Organic polymers
,
Physicochemistry of polymers
,
Polymerization
,
Preparation, kinetics, thermodynamics, mechanism and catalysts
,
silica
,
supported metallocene
,
tris(pyrazolyl)borate titanium
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