Ziegler-Natta polymerization catalysts
Kinetic resolution of chiral alpha-olefins using enantiopure Ziegler-Natta polymerization catalysts
... first polymerization data using (S)-2 was obtained by Chris ...a polymerization experiment involved adding MAO, tetradecane, olefin, and catalyst solution into a 10-mL round bottom flask equipped with a ...
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Investigation of Alkoxysilanes in the Presence of Hydrogen with Ziegler Natta Catalysts in Ethylene Polymerization
... According to Table 3, it is seen that catalytic activity was lower when adding external donor. This is because electron donor can form complex with both cocatalyst and active sites [2, 12, 18, 24]. As a consequence, the ...
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Comparison of Activity of Ziegler Natta Catalysts Prepared by Recrystallization and Chemical Reaction Methods towards Polymerization of Ethylene
... In this study, two different catalyst preparation methods namely chemical reaction and recrystallization were synthesized and compared in order to clarify the correlation between their nature and polymerization ...
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Active site nature of magnesium dichloride-supported titanocene catalysts in olefin polymerization
... Ziegler-Natta catalysts are multi-site catalysts, whose active sites are non-uniform in terms of structures and catalytic ...in Ziegler-Natta catalysts are regarded as ...
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Addition of a second alcohol in magnesium ethoxide synthesis as a way to vary the pore architecture of Ziegler-Natta catalysts
... n Ziegler-Natta olefin polymerization, the pore architecture of catalysts plays a crucial role in catalytic performances and polymer ...-based Ziegler-Natta catalysts by ...
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Investigation of Effective Factors on the 4th Generation Ziegler-Natta Catalyst Activity by Design of Experiments - Volume 2 Number 4 (Aug. 2011) - IJCEA
... of Ziegler- Natta catalyst in slurry polymerization of propene” ...generation Ziegler-Natta catalyst using design of experiments”, ...modern Ziegler – Natta ...
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Storage time effect on dynamic structure of MgCl2.nEtOH adducts in heterogeneous Ziegler-Natta catalysts
... the catalysts was evalu- ated in slurry phase polymerization of propylene using triethylaluminum (TEA) as ...the catalysts show similar stereospecificity but with different activities, so, here we ...
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Copolymerization of ethylene with α-olefins over highly active supported Ziegler-Natta catalyst with vanadium active component
... ethylene/α-olefin polymerization on the VMC catalyst makes it possible to obtain copolymers with a high yield (10-16 kg gcat -1 cat for 2 h) and broad and bimodal ...
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Polymerization of methyl acrylate and as comonomer with ethylene using single-site catalysts
... Single-site catalysts represent the most recent generation of Ziegler/Natta catalysts, which in contrast to the latter only form one active catalytic ...Single-site catalysts not only ...
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Titanium complexes of phosphinimide ligands with pendant hemilabile donars.
... radical polymerization methods. These catalyst systems, for which Ziegler and Natta won the Nobel Prize in 1963, and modem variations still account for more than 15 million tons o f polyethylene and ...
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Ziegler-Natta catalysts for propylene polymerization – Interaction of an external donor with the catalyst
... study. Catalysts TMC-A and TMC-B were prepared using an MgCl 2 carrier obtained by reacting Mg with BuCl in heptane in the absence of electron donor compounds, and con- secutive treatment of this MgCl 2 carrier ...
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Study of Ziegler-Natta/(2-PhInd)2ZrCl2 hybrid catalysts performance in slurry propylene polymerization
... metallocene catalysts using triethylaluminum (TEA) as coupling ...hybrid catalysts through ICP-OES and EDXA reveals that temperature plays a crucial role on anchoring of the metallocene catalyst on ZN while ...
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Bis(thiophenolate)pyridine Pincer Ligands and Trivalent Zirconocene Complexes Relevant to Earlv Transition Metal Polymerization Catalysts
... information about the nature and reaction tendencies of Zr(III) complexes, which arise under polymerization conditions, is still rather limited. Identifying these reduced species and determining the mechanisms of ...
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Dissymmetric dinuclear transition metal complexes as dual site catalysts for the polymerization of ethylene
... The dinuclear catalysts 7-11 showed lower polymerization activities compared to the summarized activities of their mononuclear precursors (Figure 6). These low activities are attributed to the reduced ...
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Dichloro{N (2,6 diisopropylphenyl) 2 [(di 2 pyridylmethyl)amino]ethanamido}iron(II) acetonitrile solvate
... as catalysts for atom-transfer reactions and controlled `living' radical polymerizations (Kamigaito et ...radical polymerization catalysts, we investigated the complexation of a ...
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Morphology control of clay-mineral particles as supports for metallocene catalysts in propylene polymerization
... Preparation of supported metallocene catalysts All operations were carried out under dry N 2 atmosphere using standard Schlenk techniques. To a three necked flask (1 L) equipped with a mechanical agitation unit, ...
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Titanasilsesquioxane Alkylaluminum Catalyst System for Ethylene Polymerization
... of catalysts indicate that catalyst 1) containing an iso-propoxide group shows maximum activ- ity while substitution of this pendant group by ethoxide 2), propoxide 3) or butoxide 4) results in considerable reduc- ...
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Preparation of Ultra High Molecular Weight Polyethylene Using Ziegler-Natta Catalyst System: Optimization of Parameters by Response Surface Methodology
... ethylene polymerization catalyzed by Ziegler-Natta catalytic system for preparing ultra high molecular weight polyethylene ...(UHMWPE). Polymerization temperature, monomer pressure, and ...
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Recent advances in the polymerization of butadiene over the last decade
... active catalysts in the butadiene ...the polymerization of butadiene with allyl Ni complexes ...the polymerization of butadiene with catalysts based on well defined nickel complexes with ...
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Living Radical Polymerization Catalysts: Synthesis, Application, and Utilization of Polymer Products in the Synthesis of Metal Nanoparticles
... CMRP. Polymerization using the RAFT method is advantageous over these other LRP techniques since the conditions are similar to those used in conventional free radical polymerization and are not as sensitive ...
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