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Diene-styrene random copolymers were hydrogenated using soluble catalysts. The reaction product was used as viscosity index improvers in multigrade lubricating oils at lower levels of loading.Read more
Styrene-butadiene random copolymers were hydrogenated in presence of soluble Ziegler catalysts. Different compositions prepared from organometallic compounds (n-butyl lithium, tri-ethyl aluminum, tri-isobutyl aluminum) and transition metal salts (acetylacetonates, 2-ethylhexanoates, octoates) were investigated. Reaction products were analyzed by GPC, IR and NMR spectroscopy. Hydrogenated random styrene-butadiene copolymers used as viscosity indexRead more
It was studied different catalytic systems type Ziegler synthesized from an organic salt of a transitional metal and an organo-metallic compound type Lewis base. It is presented a synthesis method for cobalt (or nickel) octoate and cobalt (or nickel) 2-ethyl-hexanoate. The influence of catalyst concentration and molar ratio between the two components onto the hydrogenation conversion is also studied. The soluble catalysts synthesized were employedRead more
The paper presents the research developed for a more exactly classification of synthetic fluids based on polymer gels into a non-Newtonian flow model. From the experimental results, using the adopted flow model, were calculated the material coefficients values k and n in function of the yield stress and shear rate.Read more
An overview of the focus of research of the Macromolecular Engineering Research Centre (MERC), which was established in 1996 at the University of Western Ontario (UWO) with industrial support by the Rubber Division of Bayer Inc., Canada. MERC's research is very broad: process, product characterization, chemistry, materials and applications.Read more
In industrial environment there is always a big challenge to follow the breakthrough front and predict the saturation of adsorption systems. The monitoring of adsorption processes is usually limited to the analysis of the outlet stream by gas chromatography. It has been found that the electrical resistance of many adsorbents including alumina gel varies upon adsorption/desorption of different materials showing a possible way for prediction of saturationRead more