Effect of MAO silica surface loading on (nBuCp)2ZrCl2 anchoring, on catalyst activity and on polymer properties

Bianchini, Daniela; Stedile, Fernanda Chiarello; Santos, João Henrique Zimnoch dos

doi:10.1016/j.apcata.2003.10.029

Cited by 32 publications

(17 citation statements)

References 26 publications

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“…For MAO pretreatment of the nanospheres, 1 g of nanospheres were placed in contact with a 4 wt% MAO (0.88 mL) solution in toluene for 5 h at 60 °C24. The slurry was then filtered through a glass frit.…”

Section: Methodsmentioning

confidence: 99%

Polyethylene Nanocomposites Obtained by in situ Polymerization via a Metallocene Catalyst Supported on Silica Nanospheres

Zapata

Quijada

Lieberwirth

et al. 2011

Macro Reaction Engineering

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Polyethylene (PE) nanocomposites were produced through in situ polymerization using bis(n‐butylcyclopentadienyl) zirconium dichloride (nBuCp)2ZrCl2 supported on silica nanospheres (SN) with diameters of 80–100 nm synthesized by the sol–gel method. The metallocene catalyst was either supported directly on the SN or on SN pretreated with methylaluminoxane (MAO). The effect of zirconium loading on the catalytic behavior and polymer properties was studied. High catalytic activities, comparable with homogeneous polymerizations, were found when the metallocene catalyst was supported directly on the SN. The catalytic activity was lower when the catalyst was supported on the MAO‐treated SN. The molecular weight of the PEs obtained using the supported systems were 40% higher than homogeneous system. TEM images show that the nanospheres were well dispersed throughout the PE matrix. There was a significant improvement in the morphology of the polymer particles for support systems.

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Section: Methodsmentioning

confidence: 99%

Polyethylene Nanocomposites Obtained by in situ Polymerization via a Metallocene Catalyst Supported on Silica Nanospheres

Zapata

Quijada

Lieberwirth

et al. 2011

Macro Reaction Engineering

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show abstract

“…Comparing the grafted content between systems using bare silica and MAO-modified one, lower metal content was observed in the latter. This fact is contrarily to that which is usually observed in the case of supported metallocenes, in which higher grafted contents were achieved in the case of MAO-modified silicas [25][26][27].…”

Section: Resultsmentioning

confidence: 46%

Supported dichlorobis(3-hydroxi-2-methyl-4-pyrone)Ti(IV) catalysts: Evaluation on ethylene polymerization

Greco

Brambilla

Einloft

et al. 2005

Journal of Molecular Catalysis A: Chemical

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“…Silica Grace 948 was activated at 450 °C for 16 h and then impregnated with 2.0 wt % of methylaluminoxane (MAO) at room temperature for 1 hour followed by filtration. A solution of Cp 2 ZrCl 2 in toluene with a ratio of 1.0 wt % of Zr/SiO 2 was supported by the grafting method31 for 1 h at room temperature over the impregnated silica. The supported metallocene was then washed 10 times with 2 mL of toluene.…”

Section: Methodsmentioning

confidence: 99%

The existence of human TII B cells remains unproven: Comment on the article by Daridon et al

Sims

Lipsky

2007

Arthritis & Rheumatism

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Effect of MAO silica surface loading on (nBuCp)2ZrCl2 anchoring, on catalyst activity and on polymer properties

Cited by 32 publications

References 26 publications

Polyethylene Nanocomposites Obtained by in situ Polymerization via a Metallocene Catalyst Supported on Silica Nanospheres

Polyethylene Nanocomposites Obtained by in situ Polymerization via a Metallocene Catalyst Supported on Silica Nanospheres

Supported dichlorobis(3-hydroxi-2-methyl-4-pyrone)Ti(IV) catalysts: Evaluation on ethylene polymerization

The existence of human TII B cells remains unproven: Comment on the article by Daridon et al

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