Immobilized Metallocene Catalysts in the Polymerization of Ethylene under High Pressure

Bergemann, Christoph; Luft, Gerhard

doi:10.1002/(sici)1521-4125(199801)21:1<33::aid-ceat33>3.0.co;2-v

Cited by 4 publications

(4 citation statements)

References 10 publications

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“…A few attempts have been reported by the immobilization of functionalized metallocene catalysts on various substrates. [18][19][20] Here we report the method of immobilizing metallocenes onto graphene oxide (GO) or reduced graphene oxide (RGO) driven by the intercalation chemistry. We believe that the driving force in this process is the strong p-p interaction between the layered carbon hosts and metallocene molecules (ferrocene, in particular, was chosen as a typical model compound in this study).…”

Section: Introductionmentioning

confidence: 99%

π–π Interaction intercalation of layered carbon materials with metallocene

Gao

Zhang

et al. 2011

Dalton Trans.

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A new hybrid material consisting of ferrocene and layered carbon (LC: graphene oxide (GO) or reduced graphene oxide (RGO)) was prepared through a facile intercalation approach. The structure of ferrocene was well maintained while the strong π-π interaction between LC and ferrocene remarkably suppressed the sublimation of ferrocene and promoted ferrocene to decompose into iron nanoparticles in between layers of LC. The hybrid exhibited excellent electrochemical properties in electrocatalytic oxidation of ascorbic acid (AA).

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Section: Introductionmentioning

confidence: 99%

π–π Interaction intercalation of layered carbon materials with metallocene

Gao

Zhang

et al. 2011

Dalton Trans.

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“…3). Unfortunately, neither 27 Al solid state NMR spectra nor TEM images of the products provided additional informations regarding the reason for the lower than expected degree of functionalization.…”

Section: Aluminiumalkyl-modified Silicamentioning

confidence: 99%

“…Owing to this procedure, leaching of the aluminium organyl during polymerization could be ruled out as proven by leaching tests. Characterization of the heterogeneous cocatalysts was attempted by microscopic and 27 Al solid state NMR investigations. Both techniques showed limitations and were performed only on two samples for each technique.…”

Section: Reactions Of Modified Silica With Aluminiumorganyls: Synthesmentioning

confidence: 99%

Fragmentable Heterogeneous Cocatalysts for the Metallocene-Catalyzed Polymerization of Olefins, II [1]. Preparation, Characterization and Testing of the Cocatalysts and Microscopic Evaluation of the Polyethylene

Schumann

Widmaier

Lange

et al. 2005

Zeitschrift Für Naturforschung B

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Surface modified silica were reacted with different aluminiumalkyls AlR2R’ (R = Me, Et, i-Bu, R’ = H, Me, Et, i-Bu), oligomeric methylaluminoxane (MAO) and combinations of both, to yield heterogeneous cocatalysts. These cocatalyts were employed to polymerize ethylene using zirconocene dichloride as the catalyst. The polymerization activity profiles have been recorded and compared with the information gained from the scanning electron microscopy (SEM) images of the polymers. The fragmentation of the heterogeneous cocatalyts upon polymerization has been demonstrated. The degree of fragmentation and the polymerization activity depend on the preparation of the silica supports and on the preparation of the heterogeneous cocatalysts using these supports. The most reactive, fragmentable heterogeneous cocatalysts show polymerization activities slightly higher than MAO in homogeneous solution and almost 1.5 times higher than commercially available MAO on silica (=MAO on Sylopol).

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“…They found that the homogeneous catalyst had four times higher activity and yielded a narrower molecular weight distribution (PDI = 2 compared to 5-10 for the heterogeneous catalyst). More recently they developed supported metallocene catalysts for the polymerization of scC2H4 [90]. Olonde ef al.…”

Section: 1 Polymerization Of Alkenes Under Supercritical Conditionsmentioning

confidence: 99%