Ethene homopolymerization and copolymerization with 1‐hexene for all methyl‐substituted (RnC5H5n)2ZrCL2/MAO catalytic systems: Effects of split methyl substitution

Wigum, Hanne; Tangen, Linda; Støvneng, Jon Andreas; Rytter, Erling

doi:10.1002/1099-0518(20000901)38:17<3161::aid-pola150>3.3.co;2-4

Cited by 15 publications

(40 citation statements)

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“…Since it is known that the Cp*-type catalyst incorporates minimum amounts of the comonomer, [8] we assume that the termination probability after the insertion of 1-hexene into Et(IndH 4 ) 2 ZrP + controls the MWD profiles. A 1 -2 regioselectivity complies with the detection of vinylidene end groups.…”

Section: Resultsmentioning

confidence: 98%

Bimodal Polyethylenes Obtained with a Dual-Site Metallocene Catalyst System. Effect of Trimethylaluminium Addition

Liu

Rytter

2001

Macromol. Rapid Commun.

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Section: Resultsmentioning

confidence: 98%

Bimodal Polyethylenes Obtained with a Dual-Site Metallocene Catalyst System. Effect of Trimethylaluminium Addition

Liu

Rytter

2001

Macromol. Rapid Commun.

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“…The vinyl and vinylidene groups may be formed by β-hydrogen elimination or β-hydrogen transfer to the monomers with ethylene or with 1-octene (after 1,2-insertion) as a last inserted monomer. The trans-vinylidene terminal group is formed when a chain with 1-octene after 2,1-insertion is involved in the reaction as the last inserted monomer [40][41][42]. Hence, different effects of comonomer on molecular weights of copolymers produced over different catalytic systems do not result from different chain termination reactions but rather from different relations between the rates of chain propagation reactions and chain termination reactions.…”

Section: Resultsmentioning

confidence: 99%

Oxovanadium(IV) complexes with [ONNO]-chelating ligands as catalysts for ethylene homo- and copolymerization

et al. 2014

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Oxovanadium(IV) complexes with [ONNO]-type tetradentate Schiff base ligands: salen, acacen, aceten, acetph (H 2 salen = N,N′-ethylenebis(salicylideneimine), H 2 aceten = N,N′-ethylenebis(2-hydroxyacetophenoneimine), H 2 acacen = N,N′-ethylenebis(acetylacetonimine), H 2 a c e t p h = N , N ′ -p h e n y l e n e -1 , 2 -b i s (2-hydroxyacetophenoneimine)), were the first time investigated in ethylene polymerization and ethylene/1-octene copolymerization processes. In general, all these complexes are moderately active precatalyst for ethylene polymerization upon activation with EtAlCl 2 and they give high molecular weight linear polyethylenes. Their activity in copolymerization was found relatively low. However, they yielded copolymers with high 1-octene incorporation even at low comonomer concentrations in the feed. The catalytic performance in homo-and copolymerization was influenced by both the ligand structure and polymerization parameters (Al/ V molar ratio, polymerization temperature, comonomer feed concentration). In addition, the [VO(acacen)] was supported onto magnesium supports, and in the presence of various cocatalyst and at different reaction conditions it was screened as the catalyst of choice for ethylene homo-and copolymerization.

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“…The fractionation method based on successive self-nucleation/annealing (SSA) was performed with the DSC according to a previously reported procedure [23].…”

Section: Characterizationmentioning

confidence: 99%

Crystallization analysis fractionation of ethene/1-hexene copolymers made with the MAO-activated dual-site (1,2,4-Me3Cp)2ZrCl2 and (Me5Cp)2ZrCl2 system

Bruaseth

Soares

Rytter

2004

Polymer

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Ethene homopolymerization and copolymerization with 1‐hexene for all methyl‐substituted (RnC5H5n)2ZrCL2/MAO catalytic systems: Effects of split methyl substitution

Cited by 15 publications

References 0 publications

Bimodal Polyethylenes Obtained with a Dual-Site Metallocene Catalyst System. Effect of Trimethylaluminium Addition

Bimodal Polyethylenes Obtained with a Dual-Site Metallocene Catalyst System. Effect of Trimethylaluminium Addition

Oxovanadium(IV) complexes with [ONNO]-chelating ligands as catalysts for ethylene homo- and copolymerization

Crystallization analysis fractionation of ethene/1-hexene copolymers made with the MAO-activated dual-site (1,2,4-Me3Cp)2ZrCl2 and (Me5Cp)2ZrCl2 system

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