Results 201 to 210 of about 37,659 (260)

Pressure induced polymerization of fluid ethylene

The Journal of Chemical Physics, 2016
The spontaneous polymerization of fluid ethylene under high temperature and pressure conditions has been characterized by using FTIR absorption spectroscopy. The fluid has been isobarically heated at pressures ranging between 0.4 and 1.5 GPa by means of a resistively heated membrane diamond anvil cell.
SCELTA, DEMETRIO, CEPPATELLI, MATTEO, BINI, ROBERTO   +2 more
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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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Ethylene polymerization reactions with Ziegler–Natta catalysts. I. Ethylene polymerization kinetics and kinetic mechanism

Journal of Polymer Science Part A: Polymer Chemistry, 1999
Kinetics of ethylene homopolymerization reactions and ethylene/1-hexene copolymerization reactions using a supported Ziegler–Natta catalyst was carried out over a broad range of reaction conditions. The kinetic data were analyzed using a concept of multicenter catalysis with different centers that respond differently to changes in reaction parameters ...
Y. V. Kissin, R. I. Mink, T. E. Nowlin
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Effect of polymerization temperature on the polymerization of ethylene with dicyclopentadienylzirconiumdichloride/ methylalumoxane catalyst

European Polymer Journal, 1996
Abstract The effect of polymerization temperature on catalyst activity and polymer properties in the polymerization of ethylene was studied. The catalyst system was a homogeneous metallocene catalyst Cp2ZrCl2 with methylaluminoxane (MAO) as a cocatalyst.
Mari Eskelinen, Jukka V. Seppälä
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Superhydrophobic Polyethylene Films by Catalytic Ethylene Polymerization

Journal of Adhesion Science and Technology, 2008
Polyethylene films were grown on a flat silica surface modified by the bis(imino)pyridyl iron(II) catalyst during ethylene polymerization in an organic solvent. The resulting films show under certain polymerization conditions superhydrophobic properties.
Thüne, P.C., Han, W., Ming, W., Niemantsverdriet, J.W.   +3 more
openaire   +1 more source

2‐Phosphanylphenolate Nickel Catalysts for the Polymerization of Ethylene

Chemistry – A European Journal, 2003
AbstractThe previously unknown methallylnickel 2‐diorganophosphanylphenolates (RPh, cHex) were synthesized and found to catalyze the polymerization of ethylene. To explore the potential for ligand‐tuning, a variety of P‐alkyl‐ and P‐phenyl‐2‐phosphanylphenols was synthesized and allowed to react with [Ni(cod)2] (cod=1,5‐cyclooctadiene) or with NiBr2 ...
Heinicke, J., Köhler, M., Peulecke, N., He, M., Kindermann, M., Keim, W., Fink, G.   +6 more
openaire   +3 more sources

Heterogeneous radical polymerization of ethylene

Polymer, 1962
Abstract In the course of investigating the polymerization of ethylene initiated by azoisobutyronitrile in the presence of small amounts of benzene at 100 to 600 atm and at 70°C several unusual features were found, connected with an unusual polymerization mechanism.
B ERUSSALIMSKY, S LYUBETZKY, W MAZUREK, S FRENKEL, L SHALTYKO   +4 more
openaire   +1 more source

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
openaire   +1 more source

Simulation of Slurry Polymerization of Ethylene

International Journal of Chemical Reactor Engineering, 2008
A model of slurry polymerization of ethylene in a multistage continuous stirred-tank reactor (CSTR) was developed in order to find the effect of stagewise variation of parameters on polymer polydispersity and rate of polymerization. Higbie's penetration theory has been used to calculate monomer absorption rate in the presence of micron-sized single ...
Nipun J Soni, Sunil S Bhagwat
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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
openaire   +1 more source