Scopul nostru este sprijinirea şi promovarea cercetării ştiinţifice şi facilitarea comunicării între cercetătorii români din întreaga lume.
Autori: I.A. Dragomirescu, L. Crisan, S. Balliu
Editorial: 9th Symposium on Lubricants Additives, Waxes & Petroleum Speciality Products, Bombay, India, 1995.
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 index improvers in multigrade lubricating oils exhibit unusually high thickening power and shear stability at very desirable levels.
Cuvinte cheie: hydrogenated copolymers, soluble catalysts, viscosity index improvers