Dynamic Model of the Copolymerization of Propylene and 1-Hexene with the Me2Si(2-Me-Ind)2ZrCl2Catalytic System: Effect of 1-Hexene Concentration

Palza, Humberto; Velilla, Teresa; Quijada, Raúl

doi:10.1080/03602550600887533

Cited by 8 publications

(17 citation statements)

References 35 publications

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“…A similar drop in the activity was reported using similar catalytic systems . The decrease by a factor of 10 in the polymer molecular weight is due to termination transfer reactions promoted by the presence of the comonomer . This phenomenon has been previously observed in the copolymerization of either linear or cyclic olefin comonomers .…”

Section: Resultssupporting

confidence: 83%

Effect of Polymer Structure and Incorporation of Nanoparticles on the Behavior of Syndiotactic Polypropylenes

Bejarano

Benavente

Pérez

et al. 2013

Macro Chemistry & Physics

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Section: Resultssupporting

confidence: 83%

Effect of Polymer Structure and Incorporation of Nanoparticles on the Behavior of Syndiotactic Polypropylenes

Bejarano

Benavente

Pérez

et al. 2013

Macro Chemistry & Physics

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“…The ''comonomer effect'' is a curious phenomenon in which the rate of ethylene polymerization is significantly enhanced by the addition of a small amount of α-olefin comonomer, while decreases as the comonomer content in monomer feed increases from an optimum amount. [39,40] On the other hand, the presence of comonomer lowered the activity of catalyst C-M slightly, from 190 to 185 kg Poly/g Ti•h, suggesting that the insertion of ethylene was interrupted in this catalyst due to high mole percent of 1-hexene in monomer feed. [39,41] The copolymers obtained were characterized and the results listed in Table 6, which collects melting point, percentage of crystalline polymer X c , and comonomer content.…”

Section: Ethylene/1-hexene Copolymerization Resultsmentioning

confidence: 90%

Highly efficient FeCl₃ doped Mg(OEt)₂/TiCl₄-based Ziegler–Natta catalysts for ethylene polymerization

Bazvand

Bahri‐Laleh

Nekoomanesh

et al. 2015

Designed Monomers and Polymers

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Seven Mg(OEt) 2 /FeCl 3 /SiCl 4 /TiCl 4 type procatalysts supported on Mg(OEt) 2 /FeCl 3 mixtures were prepared in order to unravel effect of Fe doping on the catalytic performance in ethylene polymerization. In polymerization experiments, the catalyst based on a support containing an optimum doping amount of 10 wt.% of FeCl 3 , i.e. C-F 10 -Si, exhibited an activity 2.4 times greater than that shown by the reference catalyst, C-M. The MW and bulk density of the produced polymers were increased, while the wax amount decreased using doped catalysts. In the next step, the copolymerization of ethylene with 1-hexene was carried out using C-M as reference and C-Fe 10 -Si as the most efficient procatalysts. In copolymerization experiments, C-Fe 10 -Si exhibited much higher activity and comonomer incorporation in comparison with reference catalyst. Finally, to shed light on possible interaction of TiCl 4 with doped and undoped catalysts, as well as their efficiency in ethylene polymerization, molecular simulation was performed. Energy results revealed that the doping does not alter significantly the capability of the Ti to insert ethylene monomer.

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“…In general, the relation between the concentration of comonomer in the reactor and its final incorporation in the main polymer chain is well known,36 and in this way it was possible to obtain several comonomer incorporations. The lower syndiotacticity found in copolymers had been explained by the increase in skipped insertions or site epimerization37 when comonomer units are incorporated in the main chain because of the lower rate of olefin insertion 25, 36. The DSC measurements of these copolymers are shown in Figures 6 and 7 for cooling and heating scans, respectively.…”

Section: Resultsmentioning

confidence: 99%

Nonisothermal crystallization and melting behavior of syndiotactic polypropylenes of different microstructure

Vanegas

Quijada

Serafini

et al. 2008

J Polym Sci B Polym Phys

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Syndiotactic polypropylenes and their copolymers with 1‐olefins were synthesized using two metallocene/MAO catalytic systems, and the effect of the different microstructures on nonisothermal crystallization and subsequent melting was studied. Using differential scanning calorimetry (DSC) it was observed that samples with lower content of defects showed crystallization on cooling from the melt, and a double melting peak in the subsequent heating scan, the latter associated with melt, recrystallization and remelt processes that it was confirmed by its nonreversing exothermic process found by means of temperature modulated DSC (MDSC). However, polymers with high amount of defects showed cold crystallization on heating followed by a melting process, that it was observed by MDSC. Wide angle X‐ray diffraction was used for characterizing the changes of crystalline forms in relationship with crystallization process. © 2008 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 46: 798–806, 2008

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Dynamic Model of the Copolymerization of Propylene and 1-Hexene with the Me₂Si(2-Me-Ind)₂ZrCl₂Catalytic System: Effect of 1-Hexene Concentration

Cited by 8 publications

References 35 publications

Effect of Polymer Structure and Incorporation of Nanoparticles on the Behavior of Syndiotactic Polypropylenes

Effect of Polymer Structure and Incorporation of Nanoparticles on the Behavior of Syndiotactic Polypropylenes

Highly efficient FeCl₃ doped Mg(OEt)₂/TiCl₄-based Ziegler–Natta catalysts for ethylene polymerization

Nonisothermal crystallization and melting behavior of syndiotactic polypropylenes of different microstructure

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Dynamic Model of the Copolymerization of Propylene and 1-Hexene with the Me2Si(2-Me-Ind)2ZrCl2Catalytic System: Effect of 1-Hexene Concentration

Cited by 8 publications

References 35 publications

Effect of Polymer Structure and Incorporation of Nanoparticles on the Behavior of Syndiotactic Polypropylenes

Effect of Polymer Structure and Incorporation of Nanoparticles on the Behavior of Syndiotactic Polypropylenes

Highly efficient FeCl3 doped Mg(OEt)2/TiCl4-based Ziegler–Natta catalysts for ethylene polymerization

Nonisothermal crystallization and melting behavior of syndiotactic polypropylenes of different microstructure

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Dynamic Model of the Copolymerization of Propylene and 1-Hexene with the Me₂Si(2-Me-Ind)₂ZrCl₂Catalytic System: Effect of 1-Hexene Concentration

Highly efficient FeCl₃ doped Mg(OEt)₂/TiCl₄-based Ziegler–Natta catalysts for ethylene polymerization