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[PDF] Top 20 Mechanistic Aspects of the Ziegler-Natta Polymerization

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Mechanistic Aspects of the Ziegler-Natta Polymerization

Mechanistic Aspects of the Ziegler-Natta Polymerization

... The isotope effect on propagation rate was determined for four homogeneous ethylene polymerization systems.. This result strongly supports an insertion mechanism which[r] ... See full document

93

Investigation of Alkoxysilanes in the Presence of Hydrogen with Ziegler Natta Catalysts in Ethylene Polymerization

Investigation of Alkoxysilanes in the Presence of Hydrogen with Ziegler Natta Catalysts in Ethylene Polymerization

... with Ziegler-Natta catalyst ...olefin polymerization such as monoester, diester, alkoxysilane, diether and etc [11, ...many aspects in propylene ...ethylene polymerization is still open ... See full document

10

Ziegler-Natta catalysts for propylene polymerization – Interaction of an external donor with the catalyst

Ziegler-Natta catalysts for propylene polymerization – Interaction of an external donor with the catalyst

... propylene polymerization at different polymerization conditions: (1) in the presence of AlEt 3 and in the ab- sence of PTMS; (2) in the presence of an external do- nor (PTMS) and AlEt 3 ; (3) after treating ... See full document

11

Kinetic resolution of chiral alpha-olefins using enantiopure Ziegler-Natta polymerization catalysts

Kinetic resolution of chiral alpha-olefins using enantiopure Ziegler-Natta polymerization catalysts

... the enantioassay procedure to the crude unreacted olefin from the polymerization reaction solution. After quenching the reaction with methanol, the solution contains the unreacted monomer, oligomer, tetradecane, ... See full document

217

Study of Ziegler-Natta/(2-PhInd)2ZrCl2 hybrid catalysts performance in slurry propylene polymerization

Study of Ziegler-Natta/(2-PhInd)2ZrCl2 hybrid catalysts performance in slurry propylene polymerization

... in polymerization (Scheme 1) ...last, polymerization of propylene is investigated using the hybrid catalysts and the resultant polymers are analyzed by DMTA and DSC ... See full document

15

Comparison of Activity of Ziegler Natta Catalysts Prepared by Recrystallization and Chemical Reaction Methods towards Polymerization of Ethylene

Comparison of Activity of Ziegler Natta Catalysts Prepared by Recrystallization and Chemical Reaction Methods towards Polymerization of Ethylene

... lll. Results and discussion 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 ... See full document

8

The relationship among changes in microstructure, active sites behavior and properties in the propylene polymerization with a 4th generation Ziegler-Natta catalyst

The relationship among changes in microstructure, active sites behavior and properties in the propylene polymerization with a 4th generation Ziegler-Natta catalyst

... and polymerization at 70°C and 7 bar monomer pressure for 2 hours was ...mentioned polymerization procedure, the reaction was terminated, the vent valve was opened and the unreacted monomer was discharged ... See full document

12

In situ stabilization of polypropylene by lignin using a Ziegler-Natta catalyst

In situ stabilization of polypropylene by lignin using a Ziegler-Natta catalyst

... Polymerizations were carried out with addition of antioxidants in the polymerization reactor. PP-crud was the polymer synthesized without antioxidant, PP- 1010 was polypropylene synthesized in the presence of ... See full document

8

Storage time effect on dynamic structure of MgCl2.nEtOH adducts in heterogeneous Ziegler-Natta catalysts

Storage time effect on dynamic structure of MgCl2.nEtOH adducts in heterogeneous Ziegler-Natta catalysts

... phase polymerization of propylene using triethylaluminum (TEA) as ...the polymerization process [22] and those species, able to generate active Ti, were frac- tionally lower in CT5 catalyst compared to ... See full document

9

Addition of a second alcohol in magnesium ethoxide synthesis as a way to vary the pore architecture of Ziegler-Natta catalysts

Addition of a second alcohol in magnesium ethoxide synthesis as a way to vary the pore architecture of Ziegler-Natta catalysts

... of Ziegler-Natta ...of Ziegler-Natta ...clarify mechanistic aspects how a second alcohol modulates the particle formation of Mg(OR) 2 ... See full document

7

Copolymerization of ethylene with α-olefins over highly active supported Ziegler-Natta catalyst with vanadium active component

Copolymerization of ethylene with α-olefins over highly active supported Ziegler-Natta catalyst with vanadium active component

... similar polymerization condi- tions (H 2 /C 2 ) makes it possible to produce ethylene- 1-butene copolymers with similar α-olefin content and molecular weight (compare data of runs 3 and 6 in Ta- ble ...the ... See full document

10

Evaluation of continuous and discrete melting endotherms in determination of structural heterogeneities in Ziegler-Natta catalyzed linear low density polyethylene

Evaluation of continuous and discrete melting endotherms in determination of structural heterogeneities in Ziegler-Natta catalyzed linear low density polyethylene

... There are two distinct regimes of thermal behavior in LLDPEs depending on the amount of comonomer content [15]. From one hand, chain folding in long enough ethylene sequences provides a constant lamel- la thickness, ... See full document

12

Preparation of Ultra High Molecular Weight Polyethylene Using Ziegler-Natta Catalyst System: Optimization of Parameters by Response Surface Methodology

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 ... See full document

8

Investigation of Effective Factors on the 4th Generation Ziegler-Natta Catalyst Activity by Design of Experiments - Volume 2 Number 4 (Aug. 2011) - IJCEA

Investigation of Effective Factors on the 4th Generation Ziegler-Natta Catalyst Activity by Design of Experiments - Volume 2 Number 4 (Aug. 2011) - IJCEA

... Figure 7: Contour plot of catalyst activity versus TEA and CHMDMS concentration. IV. C ONCLUSIONS Effect of TEA as cocatalyst and CHMDMS as external electron donor on catalyst activity in propylene polymerization ... See full document

5

The study and synthesis of Group 4 transition metal complexes in Ziegler Natta catalysis

The study and synthesis of Group 4 transition metal complexes in Ziegler Natta catalysis

... Ligand properties and conformational changes 34 Tetradentate Schiff base complexes of transition metals 35 Group 4 tetradentate Schiff base complexes 37.. CHAPTER 2 Tetradentate [r] ... See full document

297

Probing into morphology evolution of magnesium ethoxide particles as precursor of Ziegler-Natta catalysts

Probing into morphology evolution of magnesium ethoxide particles as precursor of Ziegler-Natta catalysts

... Likewise, many ways have been empirically devel- oped to control the morphology of Mg(OEt) 2 particles, while systematic understanding is still lacking on the origin of the particle morphology in the synthesis of Mg(OEt) ... See full document

11

A mechanistic investigation of Pickering emulsion polymerization

A mechanistic investigation of Pickering emulsion polymerization

... emulsion polymerization would be the heterocoagulation of growing oligoradicals in the water phase on silica nanoparticles, with a possible post rearrangement of these colloidal objects into primary nanocomposite ... See full document

13

A study of some novel cationic complexes of the group 4 metals and their applications in Ziegler Natta catalysis

A study of some novel cationic complexes of the group 4 metals and their applications in Ziegler Natta catalysis

... It was therefore decided to conduct polymerisation reactions over the CpMC13 series and the cations derived thereof under similar conditions. Generally, the results obtained for [r] ... See full document

181

Antioxidants and Atherosclerosis: Mechanistic Aspects

Antioxidants and Atherosclerosis: Mechanistic Aspects

... 6. Combination antioxidant therapies may prove to be more effective overall because they may exploit any additional constituent mechanistic properties [16]. Diet plays an important role in the prevention of ... See full document

19

Synthetic, reactivity, and mechanistic studies relevant to olefin oligomerization and polymerization

Synthetic, reactivity, and mechanistic studies relevant to olefin oligomerization and polymerization

... for mechanistic studies – Synthesis of CrBr(o,o’-biphenyldiyl)[ κ 3 -(P,P,O)-(PNP O4 )] (32) The proposed mechanism involves a chromacyclopentane intermediate; 29,39-42 isolation of such a complex could provide, ... See full document

455

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