Results 11 to 20 of about 37,659 (260)

Decompositions in the production of low density polyethylene: Reasons, consequences and prevention [PDF]

Hemijska Industrija, 2007
In the production of low density polyethylene by free radical polymerization of ethylene at high pressure, ethylene and polyethylene occasionally decompose to carbon, hydrogen and methane resulting in an enormous increase of pressure and temperature ...
Stoiljković Dragoslav M., Jovanović Slobodan M., Đorđević Jovica B., Damjanović Budimir Lj.   +3 more
doaj   +1 more source

Dissymmetric dinuclear transition metal complexes as dual site catalysts for the polymerization of ethylene [PDF]

Polyolefins Journal, 2014
A series of dissymmetric dinuclear complexes were synthesized, as dual site catalysts in ethylene polymerization, by coupling the allylated a-diimine complexes of the metals Ti, Zr, V, Ni and Pd with the ansa-zirconocene complex [C5H4-SiH(Me)-C5H4]ZrCl2 ...
Haif Alshammari, Helmut G. Alt
doaj   +1 more source

Synthesis of High-Molecular-Weight Branched Polyethylene Using a Hybrid “Sandwich” Pyridine-Imine Ni(II) Catalyst

Frontiers in Chemistry, 2022
Most pyridine-imine Ni(II) and Pd(II) catalysts tend to yield low-molecular-weight polyethylene and ethylene-based copolymers in olefin insertion polymerization, as the unilateral axial steric structure of such complexes often cannot provide effective ...
You Ge, You Ge, Qi Cai, Yuyin Wang, Jiangang Gao, Yue Chi, Shengyu Dai, Shengyu Dai   +7 more
doaj   +1 more source

Facile Investigation of Ti3+ State in Ti-based Ziegler-Natta Catalyst with A Combination of Cocatalysts Using Electron Spin Resonance (ESR)

Bulletin of Chemical Reaction Engineering & Catalysis, 2020
This study aims to investigate the influences of a combination of cocatalysts including triethylaluminum (TEA) and tri-n-octylaluminum (TnOA) for activation of a commercial Ti-based Ziegler-Natta catalyst during ethylene polymerization and ethylene/1 ...
Thanyaporn Pongchan, Piyasan Praserthdam, Bunjerd Jongsomjit   +2 more
doaj   +1 more source

The charge percolation mechanism and simulation of Ziegler–Natta polymerizations. Part VI. Mechanism of ethylene polymerization by supported chromium oxide [PDF]

Journal of the Serbian Chemical Society, 2007
Despite intensive research over the last 50 years, many questions concerning ethylene polymerization by supported chromium oxide are still unanswered. Hence, the very fundamental issues of this polymerization are discussed in this paper. It is shown that
DRAGOSLAV STOILJKOVIC, BRANKA PILIC, MISA BULAJIC, NEBOJSA DJURASOVIC, NIKOLAJ OSTROVSKI   +4 more
doaj   +3 more sources

Homo-polymerization of α-Olefins and Co-polymerization of Higher α-Olefins with Ethylene in the Presence of CpTiCl2(OC6H4X-p)/MAO Catalysts (X = CH3, Cl)

Molecules, 2005
Cyclopentadienyl-titanium complexes containing –OC6H4X ligands (X = Cl,CH3) activated with methylaluminoxane (MAO) were used in the homo-polymerizationof ethylene, propylene, 1-butene, 1-pentene, 1-butene, and 1-hexene, and also in co-polymerization
Z. Wieczorek, D. Jamanek, K. Nicinski, W. Skupinski   +3 more
doaj   +1 more source

The Influence of Mixed Activators on Ethylene Polymerization and Ethylene/1-Hexene Copolymerization with Silica-Supported Ziegler-Natta Catalyst

Molecules, 2010
This article reveals the effects of mixed activators on ethylene polymerization and ethylene/1-hexene copolymerization over MgCl2/SiO2-supported Ziegler-Natta (ZN) catalysts. First, the conventional ZN catalyst was prepared with SiO2 addition.
Piyasan Praserthdam, Nichapat Senso, Bunjerd Jongsomjit, Supaporn Khaubunsongserm   +3 more
doaj   +1 more source

Impact of AlCl3 and FeCl2 Addition on Catalytic Behaviors of TiCl4/MgCl2/THF Catalysts for Ethylene Polymerization and Ethylene/1-Hexene Copolymerization

Bulletin of Chemical Reaction Engineering & Catalysis, 2018
The present research focuses on elucidating of the impact of Lewis acids including AlCl3 and FeCl2 addition on catalytic behaviors during ethylene polymerization and ethylene/1-hexene copolymerization over the TiCl4/MgCl2/THF catalyst (Cat. A).
Thanyathorn Niyomthai, Bunjerd Jongsomjit, Piyasan Praserthdam   +2 more
doaj   +1 more source

A New Vanadium (III) Complex of 2,6-Bis(3,5-diphenylpyrazol-1-ylmethyl)pyridine as a Catalyst for Ethylene Polymerization

Molecules, 2013
The tridentate ligand 2,6-bis(3,5-diphenylpyrazol-1-ylmethyl)pyridine, abbreviated as 2,6-[(3,5-ph2pz-CH2)2-py], a new pyridine-pyrazole derivative, was prepared from 2,6-bis(bromomethyl)pyridine and 3,5-diphenylpyrazole.
Hanna S. Abbo, Salam J. J. Titinchi
doaj   +1 more source

Phillips catalysts synthesized over various silica supports: Characterization and their catalytic evaluation in ethylene polymerization [PDF]

Polyolefins Journal, 2016
Ethylene polymerization was carried out using Phillips chromium catalyst based on silica supports such as silica aerogel, SiO2 (Grace 643), and titanium modified SiO2 (G 643), and the results were compared with other catalysts based on SiO2 (Aldrich ...
Ebrahim Ahmadi, Zahra Mohamadnia, Sajjad Rahimi, Mohammad Hasan Armanmehr, Mohammad Hossein Heydari, Mahmood Razmjoo   +5 more
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