Olefin homopolymerization catalyzed over asymmetric and symmetric ni(II) diimine complexes

Seo, Tae Seok; Hong, Dae Sun; Jung, Dong Wook; Cho, Hyun Yong; Woo, Seong Ihl

doi:10.1007/bf02699307

Cited by 4 publications

(3 citation statements)

References 17 publications

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“…Ethyl groups have a lower stereo volume than isopropyl groups and then it is possible to observe that complex that leaves the most exposed nickel atom produces polymers with a higher crystalline fraction, while bulkier substituents provide greater ease of transfer reactions. Moreover, the higher steric hindrance the more difficult the chain termination by associative displacement transfer (Hβ) [23].…”

Section: Influence Of the Complex Structure On The Ethylene Polymerizmentioning

confidence: 99%

Synthesis and Evaluation of Arylimino Pyridine Nickel(II) Catalysts: Influence of Substituents on Polyethylene Structure

Rocha¹,

Ferreira²,

Marques

2015

ChChT

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Abstract. The asymmetric arylimino pyridine Ni(II) catalysts have been examined with different substituents including diisopropyl, diethyl, fluoro, and chloro groups. The influence of these substituents and variation of ethylene pressure on the catalytic activity, crystalline structure, as well as on thermal properties of polyethylene has been investigated. The result show that complexes with substituent alkyl groups, which provide the increased electron density on the metal center ( o -diethyl and o-diisopropyl) exhibit higher activity, compared to those with electron acceptors substituents (o-fluoro and o-chloro).

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Section: Influence Of the Complex Structure On The Ethylene Polymerizmentioning

confidence: 99%

Synthesis and Evaluation of Arylimino Pyridine Nickel(II) Catalysts: Influence of Substituents on Polyethylene Structure

Rocha¹,

Ferreira²,

Marques

2015

ChChT

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“…~³ molecular sieve adsorption öro Ê @@Ñ M« s Wz Q-OÇ Ê ôfõ «ÄGñ ~-GÊÉ G2 í Hê π-comlexation Yk³ >J ~-õ «ÄG2 ör«. c³ X, Y zeolite÷ polystyrenes @@³ ÄGñ ñ,Ñ M « s WzQ-OÇ Ê ôfõ «ÄK [9,10]. .~³ absorptions «ÄK öro propionitrile«÷ p-xylene Ùê ço Ä kÑ M« ¯ C-2 o dYís ÄgQ-OÇ ÄUs «ÄGñ ethylene/ethane, propylene/propane Ùs ~-G2) «Ä K [9,11].…”

Section: «unclassified

“…Í¤, HNO 3 Ù MJ 9Ss <4Ý2 Y× s ¤}G. {ê ç« 4Í@ AEQs ¡¤³ Gñ Y×s D} G. ~2 pyridine P 9S ¡d, .~2 H P 9S ¡ d, »~2 Í¤ P 9S ¡d, K@Lk³ copper powderQ cuprous nitrate trihydrate P 9S ¡d Ùs g MJ õ 2 Y×s ¤}G. Cu(0)ê Cu(II)õ äQE Cu(I)õ G, .g2 ligand³ pyridine« 1®G[10,15]. «6K pyridines ¬O ñ…”

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SEPARATION OF ISOPRENE COMPOUNDS VIA Π-Complexation IN C5 MIXTURES

Son¹,

Choi²,

Kim³

et al. 2004

Frontiers on Separation Science and Technology

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Synthesis of LDPE Using Pyridineimine‐Based Nickel (II) Bromide Complexes: Effect of Catalyst Bulkiness on Thermal, Structural, and Morphological Properties

Mogheiseh

Zohuri

Khoshsefat

2018

Macro Reaction Engineering

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The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/mren.201800006. Pyridine-Imine CatalystA series of pyridine-imine [N-N] ligands are efficiently prepared through the condensation reaction of ketone/aldehyde precursor and synthesized aniline. The ligands (L n , n = 1-4) and corresponding nickel complexes (C n , n = 1-4) are characterized and used for polymerization of ethylene in the presence of modified methylaluminoxane as cocatalyst. The produced low density polyethylenes show at least 21 branches per 1000 carbon atoms with M v values up to 80.0 × 10 4 . Aldimino-based catalyst is more active than the analogue catalyst, although, ketimines result in polyethylene with higher M v . Nevertheless, the product of aldimino-based catalyst indicates the highest melting point of 132.3 °C but ketimine exhibits the highest crystallinity of 32.98% at the same polymerization conditions. Specific morphologies including smooth spherical and irregular porous particles are observed for some polymer samples. However, at high polymerization temperatures and different monomer pressures, different morphologies as well as two melting point peaks are observed in scanning electron microscopy (SEM) images and differential scanning calori meter thermograms, respectively.

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Olefin homopolymerization catalyzed over asymmetric and symmetric ni(II) diimine complexes

Cited by 4 publications

References 17 publications

Synthesis and Evaluation of Arylimino Pyridine Nickel(II) Catalysts: Influence of Substituents on Polyethylene Structure

Synthesis and Evaluation of Arylimino Pyridine Nickel(II) Catalysts: Influence of Substituents on Polyethylene Structure

SEPARATION OF ISOPRENE COMPOUNDS VIA Π-Complexation IN C5 MIXTURES

Synthesis of LDPE Using Pyridineimine‐Based Nickel (II) Bromide Complexes: Effect of Catalyst Bulkiness on Thermal, Structural, and Morphological Properties

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