Results 301 to 310 of about 124,501 (357)

Morphology of plasma-polymerized ethylene

Journal of Applied Physics, 1973
A highly crosslinked amorphous polymer is produced by passing ethylene through a radio-frequency electric discharge. The morphology of plasma-polymerized ethylene is examined by replica electron microscopy. It is found that at low pressures and flow rates spherical powder particles are formed ranging in size between 0.2 and 1.2 μm.
M. Niinomi, H. Kobayashi, A. T. Bell, M. Shen   +3 more
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Continuous polymerization of ethylene oligomers

Chemistry and Technology of Fuels and Oils, 1986
The authors conduct experiments which demonstrate the feasibility of using ethylene oligomers as raw material in the production of M-9SV synthetic lube oil. Basic characteristics of the starting materials used in the studies are given. The polymerization catalyst was AlCl/sub 3/.
V. N. Lyubomirov, I. V. Filimonov
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Low‐Temperature Polymerization of Ethylene

Angewandte Chemie International Edition in English, 1963
AbstractA two‐component organometallic catalyst of composition CH3TiCl3·CH3AlCl2 effects high‐speed polymerization of ethylene in the presence of chlorinated hydrocarbons at low temperatures. The catalyst does not undergo any alteration in the process. In contrast to the Ziegler catalysts, the titanium remains quadrivalent.
H. Bestian, K. Clauss, H. Jensen, E. Prinz   +3 more
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Confinement-Induced Polymerization of Ethylene

The Journal of Physical Chemistry C, 2011
Density functional theory (DFT) calculations show changes in geometric and electronic properties of an ethylene molecule confined between two metal surfaces and its conversion into a radical anion ...
Gustavo E. Ramirez-Caballero, Ashish Mathkari, Perla B. Balbuena   +2 more
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Switchable Chromium(II) Ethylene Oligomerization/Polymerization Catalyst

Organometallics, 2005
The tri- and divalent chromium derivatives of [N-Me,tripyrr] ([N-Me,tripyrr] = 2,5-bis(diphenyl(pyrrol-2-yl)methyl)-1-methylpyrrole) [N-Me,tripyrr]CrCl (1), and [N-Me,tripyrr]Cr(L)2·(THF)0.5 (2) [L = THF (2a), pyridine (2b)] were obtained in good yield from the reaction of the dipotassium salt of the ligand with CrCl3(THF)3 and CrCl2(THF)2 ...
Crewdson, P, Gambarotta, S, Djoman, MC, Korobkov, Ilia, Duchateau, R   +4 more
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Catalytic systems for ethylene polymerization

Petroleum Chemistry U.S.S.R., 1965
Abstract 1. 1. Ethylene polymerization on catalytic systems obtained by the reaction of titanium trichloride with chlorinated aluminium or by joint chlorination of titanium and aluminium in benzene, has been studied. 2. 2. The direction of the process towards polymerization or alkylation depends on the molar ratio of Cl/Al in the ...
G RAZUVAYEV, K MINSKER, G FEDOSEYEVA
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Ethylene polymerization reactions with Ziegler–Natta catalysts. II. Ethylene polymerization reactions in the presence of deuterium

Journal of Polymer Science Part A: Polymer Chemistry, 1999
Ethylene polymerization reactions with many Ziegler–Natta catalysts exhibit several features which differentiate them from polymerization reactions of α-olefins: a relatively low ethylene reactivity, higher polymerization rates in the presence of α-olefins, a high reaction order with respect to ethylene concentration, and strong reversible rate ...
Y. V. Kissin, A. J. Brandolini
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Chromocene catalysts for ethylene polymerization: Scope of the polymerization

Journal of Polymer Science Part A-1: Polymer Chemistry, 1972
AbstractChromocene deposited on silica supports of high surface area forms a highly active catalyst for polymerization of ethylene. Polymerization is believed to occur by a coordinated anionic mechanism previously outlined. The catalyst formation step liberates cyclopentadiene and leads to a new divalent chromium species containing a cyclopentadienyl ...
Frederick J. Karol, George L. Karapinka, Chisung Wu, Alan W. Dow, Robert N. Johnson, Wayne L. Carrick   +5 more
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Chain transfer in ethylene polymerization

Journal of Polymer Science Part A-1: Polymer Chemistry, 1966
AbstractChain transfer constants in the homogeneous free‐radical polymerization of ethylene at 1360 atm. and 130°C. have been determined for over 50 compounds, including nearly 300 hydrocarbons. The effects of substitution, unsaturation, and ring strain in the transfer agent molecule on the reactivity of its CH bonds in chain‐transfer reactions with a
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Heterogeneous metallocene catalysts for ethylene polymerization

Journal of Molecular Catalysis A: Chemical, 2001
The catalyst precursor 9-fluorenylidene-1-cyclopentadienylidene-2-hex-5-enylidene zirconium dichloride proved to be highly active in the heterogeneously catalyzed polymerization of ethylene using silica gel/partially hydrolyzed trimethylaluminum (PHT) as cocatalyst.
Alexander Köppl, Helmut G Alt
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