Gerhard Luft

Technical University of Darmstadt

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Alexander Rau

Federal Institute For Materials Research and Testing

Hans Seidl

Technical University of Munich

Christian Götz

Johannes Gutenberg University Mainz

M. Kinzl

Siemens (Germany)

Max Dorn

HolsboerMaschmeyer NeuroChemie (Germany)

Thomas Wieczorek

Technical University of Darmstadt

G. Richter

Siemens (Germany)

Manfred Schrod

Darmstadt University of Applied Sciences

U. Gebhardt

Deutsche Nationalbibliothek

Richard Cropp

Technical University of Darmstadt

Cooperative Institutions

Darmstadt University of Applied Sciences

Technical University of Darmstadt

Siemens (Germany)

Technical University of Munich

Universität Greifswald

University of Padua

Karlsruhe Institute of Technology

Heidelberg University

Johannes Gutenberg University Mainz

Ludwig-Maximilians-Universität München

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Decomposition of polymerization initiators under high pressures

Die Angewandte Makromolekulare Chemie (1978)

Gerhard Luft Peter Mehrling Hans Seidl

Abstract A number of diacylperoxides, peroxydicarbonates, peresters and dialkylperoxides with various substituents were chosen to investigate their homolytic decomposition under pressures of up to 3000 bar and high temperatures of up to 200°C, discontinuously in steel autoclaves, in an optical high pressure cell and in flow processes. The measurements, carried out in isododecane as solvent with a peroxide concentration of 1% by weight show that pressure has a strong influence on the decomposition: the half‐life time at 3000 bar is twice that at normal pressure. The pressure dependence, which varies according to the structure of the peroxide and the decomposition mechanism, is interpreted by means of the activation volumes. On the basis of the results, recommendations are made on the choice of peroxides suitable as polymerization initiators for application at high pressures and temperatures.

Homolysis

Peroxide

Bar (unit)

10.1002/apmc.1978.050730108

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Citations (27)

Use of metallocene catalysts in the polymerization under high pressure

Process technology proceedings (1996)

Gerhard Luft

Gel permeation chromatography

Coordination polymerization

Methylaluminoxane

Molar mass distribution

Post-metallocene catalyst

Autoclave

Suspension polymerization

Thermal Stability

10.1016/s0921-8610(96)80014-8

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Citations (2)

Principles and Practice of Heterogeneous Catalysis. J. M. Thomas, Wiley‐VCH Verlagsgesellschaft, Weinheim, 669 Seiten; brosch., DM 88,– ISBN 3‐527‐29239‐x

Chemie Ingenieur Technik (1998)

Gerhard Luft

10.1002/cite.330700521

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Citations (8)

High-pressure polymerization with metallocene catalysts

Industrial chemistry library (2001)

Gerhard Luft

Post-metallocene catalyst

10.1016/s0926-9614(01)80031-9

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Citations (1)

Elektroosmotische Pumpe zur gleichmäßigen, gesteuerten oder geregelten Medikamentendosierung - Electroosmotic pump for steady regulated or controlled release of medicaments

Biomedical Engineering / Biomedizinische Technik (2009)

Gerhard Luft David A. Kuhl G. Richter

10.1515/bmte.1977.22.7-8.169

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Citations (11)

Safety and Control in High Pressure Plant Design and Operation

Industrial chemistry library (2001)

Gerhard Luft Siegfried Maier Gerhard Luft E. Lack H. Seidlitz

10.1016/s0926-9614(01)80025-3

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Citations (2)

Influence of the Radical Scavenger t-Butanol on the Wet Air Oxidation of p-Toluenesulfonic Acid

Chemical Engineering & Technology (1999)

Birgit Stöffler Gerhard Luft

Industrial and municipal waste water often contain less biodegradable components which prevent a biological treatment. To achieve a quantitative destruction of the less biodegradable components, especially chemical oxidants like hydrogen peroxide or ozone are suitable. Since the wet air oxidation processes usually do not lead to a quantitative oxidation of the components, they are combined with a biological purification step. The originally less biodegradable, toxic components are converted to easily biodegradable, atoxic components by wet air oxidation. A problem of wet air oxidation is the presence of components, which can scavenge hydroxyl radicals in waste water and sewage sludges.

p-Toluenesulfonic acid

Scavenger

n-Butanol

10.1002/(sici)1521-4125(199905)22:5<409::aid-ceat409>3.3.co;2-4

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Citations (1)

Hydroformylation of long-chain alkenes with new supported aqueous phase catalysts

Applied Catalysis A General (2005)

Carsten Disser Christian Muennich Gerhard Luft

Alkene

Reaction rate

1-Hexene

10.1016/j.apcata.2005.08.027

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Citations (27)

Polymerisation of propene with a metallocene catalyst under high pressure

Gerhard Luft K. Mattes Patrick Brant R. Shutt

Propene

Post-metallocene catalyst

Source

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Radikalische hochdruckpolymerisation von ethylen im zweiphasensystem

Die Makromolekulare Chemie (1988)

Gerhard Luft Norbert Fischer

Abstract In order to modify the properties of low density polyethylene (LDPE), the radically initiated polymerization of ethylene can be performed at pressures below 1200 bar and moderately high temperatures. Under such conditions the reaction mixture separates into a less dense phase, rich in monomer, and a dense phase, rich in polymer. The polymerization proceeds mainly in the monomer‐rich phase. When the polymer concentration exceeds the solubility limit, polymer precipitates from the monomer‐rich phase and moves into the polymer‐rich phase. By polymerization under two‐phase conditions, polyethylene resins with a narrow molecular weight distribution can be obtained.

Low-density polyethylene

Molar mass distribution

10.1002/macp.1988.021890417

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Citations (1)