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The number of active centers and propagation rate constant in ethylene polymerization with a homogeneous catalyst based on cobalt 2,6-bis[imino]pyridyl complex with methylaluminoxane activator
Pleiades Publishing Ltd - Tập 50 - Trang 326-329 - 2008
A. A. Barabanov, N. V. Semikolenova, G. D. Bukatov, M. A. Mats’ko, V. A. Zakharov
The number of active centers C p and propagation rate constant k p upon ethylene polymerization with a homogeneous catalyst based on a cobalt complex with bis[imino]pyridyl ligands (LCoCl2, where L is 2,6-(2,6-(Me)2C6H3N=CMe)2C5H3N) using methylaluminoxane as an activator was det...... hiện toàn bộ
Spherical mesoporous silica nanoparticles/tailor-made polystyrene nanocomposites by in situ reverse atom transfer radical polymerization
Pleiades Publishing Ltd - Tập 56 - Trang 909-918 - 2014
Khezrollah Khezri, Hossein Roghani-Mamaqani, Mohammadreza Sarsabili, Masoud Sobani, Seyed-Ataollah Mirshafiei-Langari
Spherical mesoporous silica nanoparticles (MCM-41)/tailor-made polystyrene nanocomposites were synthesized by in situ reverse atom transfer radical polymerization. Characteristics of spherical MCM-41 nanoparticles were evaluated by nitrogen adsorption/desorption isotherm and X-ray diffraction. Morphological studies were also performed by scanning and transmission electron microscopy. Conversion an...... hiện toàn bộ
Complexes of Polyethyleneimine with Cu2+ Ions in Aqueous Solutions as Precursors for Obtaining Copper Nanoparticles
Pleiades Publishing Ltd - Tập 61 - Trang 261-265 - 2019
D. R. Ustyakina, A. S. Chevtaev, A. I. Tabunshchikov, A. S. Ozerin, F. S. Radchenko, I. A. Novakov
The regularities of the formation of a polyethyleneimine complex with copper ions in aqueous solutions have been studied. It has been shown that the complex of polyethylenimine with copper ions is formed according to the principle of uniform distribution of ions over a macromolecule, and the composition of the complex may vary depending on the molar ratio of reagents and pH of the medium. The synt...... hiện toàn bộ
Effect of the zeolite support on the polymerization of propylene with immobilized ansa-zirconocene catalysts
Pleiades Publishing Ltd - Tập 51 - Trang 401-408 - 2009
I. N. Meshkova, O. I. Kudinova, N. Yu. Kovaleva, V. G. Grinev, T. A. Ladygina, E. V. Kiseleva, L. A. Novokshonova
Anchored aluminoxanes are synthesized by the reaction of aluminum alkyls AlMe3 and Al(i-Bu)3 with water contained in the intracrystalline cavities of synthetic and natural zeolites (NaY (Si: Al = 5), HZSM-5 (Si: Al = 17 or 34), NH4ZSM-5 (Si: Al = 32), NaZSM-5 (Si: Al = 42), and clinoptilolite-containing tuff) and are used for the synthesis of heterogenized complexes of ansa-zirconocenes (rac-C2H4(...... hiện toàn bộ
Polymerization of higher α-olefins with the catalytic system (4R,5R)-2,2-dimethyl-1,3-dioxolane-4,5-bis(perfluorophenyldimethanolate) titanium(IV) dichloride-organoaluminum compound
Pleiades Publishing Ltd - Tập 53 - Trang 299-306 - 2011
S. Ch. Gagieva, V. A. Tuskaev, O. V. Smirnova, S. S. Galibeev, B. M. Bulychev, N. M. Bravaya
The catalytic activity of the titanium(IV) dichloride complex with the (4R,5R)-2,2-dimethyl-1,3-dioxolane-4,5-bis(perfluorophenyldimethanol) ligand in the presence of a cocatalyst (polymethylaluminoxane, triethylaluminum, or triisobutylaluminum) in the polymerization of higher α-olefins (1-hexene, 1-octene, 1-decene) is investigated. It is shown that, depending on the types of cocatalyst and monom...... hiện toàn bộ
Nanostructures in polymer systems
Pleiades Publishing Ltd - Tập 48 Số 4 - Trang 213-225 - 2006
S. S. Ivanchev, А. N. Ozerin
Reversible addition-fragmentation chain-transfer polymerization: Fundamentals and use in practice
Pleiades Publishing Ltd - Tập 59 Số 2 - Trang 117-146 - 2017
Е. В. Черникова, E. V. Sivtsov
Single-stage synthesis of phosphazene-containing epoxy oligomers
Pleiades Publishing Ltd - Tập 56 - Trang 471-476 - 2014
I. S. Sirotin, Yu. V. Bilichenko, K. A. Brigadnov, V. V. Kireev, B. M. Prudskov, R. S. Borisov
A single-stage synthesis of phosphazene-containing epoxy oligomers via the direct interaction of hexachlorocyclotriphosphazene, diphenylolpropane and epichlorohydrin has been proposed. The resulting products are composed of a common epoxy-diane oligomer and an epoxyphosphazene component, with the content of the latter being up to 45 wt %. Oligomers with epoxy numbers up to 22 were characterized wi...... hiện toàn bộ
Epoxy nanocomposites co-reinforced by two dimensionally different nanoscale particles
Pleiades Publishing Ltd - - 2011
Xi Li, Zai-Ji Zhan, Gui-Rong Peng, Wen-Kui Wang
Comprehensive high-performance epoxy nanocomposites were prepared by simultaneous incorporating montmorillonite (MMT) and nanoSiO2 into epoxy. Mechanical tests and thermal analyses showed that the epoxy/MMT/nanoSiO2 nanocomposites obtained considerable improvement over basic epoxy in tensile modulus, tensile strength, flexural modulus, flexural strength, notch impact strength, glass transition tem...... hiện toàn bộ
Topochemical aspects of elementary reactions of the emulsion polymerization of acrylonitrile
Pleiades Publishing Ltd - Tập 52 - Trang 381-390 - 2010
N. M. Bol’bit, E. A. Dubova, V. R. Duflot
A combination of statistic and kinetic methods of analysis is used to collect quantitative data on the kinetics of elementary reactions of growth and termination of kinetic chains in each phase of a heterophase system as well as on interfacial mass exchange at the quasistationary stage of radiation-induced emulsion polymerization of acrylonitrile. It is found that, in the system, a steady-state co...... hiện toàn bộ
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