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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
Bismaleimide and bispropargyl ether blends: Curing kinetics—Model free approach
Pleiades Publishing Ltd - Tập 56 - Trang 603-615 - 2014
R. Surender, A. Thamaraichelvan, S. Alam, C. T. Vijayakumar
Two structurally different bismaleimides, namely 2,2-bis[4-(4-maleimidophenoxy-phenyl)]propane (BMIX) and 5(6)-maleimide-1(4′-maleimidophenyl)-1,3,3′-trimethyl indane (BMII) and bispropargyl ether of bisphenol A (BPEBPA) were prepared. The two bismaleimides were separately blended with BPEBPA in different mole ratios [BMIX/BMII: BPEBPA = 100: 0, 75: 25, 50: 50, 25: 75, 0: 100%] and the materials w...... hiện toàn bộ
Cyanate Ester Monomers and Oligomers. Overview of the Modern Research State and Perspectives
Pleiades Publishing Ltd - Tập 64 - Trang 241-270 - 2022
V. S. Anshin
Modern approach to the study of monomers and oligomers as precursors of cyanate ester resins, promising binders for the preparation of composites, has been suggested. Basing on the analysis of the reference data for the recent 60 years, the information about the structure of the cyanate ester binders, their properties, and characteristics of the derived polymers has been collected and structured. ...... 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
Oxidative polymerization of diphenylamine: A mechanistic study
Pleiades Publishing Ltd - Tập 48 - Trang 11-17 - 2006
A. V. Orlov, S. Zh. Ozkan, G. P. Karpacheva
The mechanism of oxidative polymerization of diphenylamine is considered. The kinetic study of diphenylamine polymerization and of the structure and molecular-mass characteristics of the reaction products has shown that the degree of oxidation of intermediates plays the key role in polyrecombination. The relationship between the polymerization procedure and the molecular mass of polydiphenylamine ...... 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
Effect of solvent nature on intrinsic viscosity of an ethylene-propylene-dicyclopentadiene copolymer
Pleiades Publishing Ltd - Tập 50 - Trang 93-96 - 2008
A. R. Khalimov, M. I. Abdullin, N. N. Sigaeva, Yu. B. Monakov
The hydrodynamic behavior of solutions of the ethyleneópropylene-dicyclopentadiene copolymer in hydrocarbon solvents has been studied. It has been shown that the effects of temperature on the thermodynamic affinities of aromatic and aliphatic solvents for copolymer macromolecules are substantially different. The thermodynamic quality of aromatic solvents relative to the copolymer and the hydrodyna...... hiện toàn bộ
Chitosan-dextran branched copolymers: Synthesis and properties
Pleiades Publishing Ltd - - 2014
V. A. Petrova, A. M. Bochek, M. F. Lebedeva, I. V. Gofman, E. N. Popova, E. N. Vlasova, B. Z. Volchek, L. A. Nud’ga
Chitosan-dextran branched copolymers have been synthesized, and the rheological properties of their aqueous acetic acid solutions have been studied. On the basis of the data of FTIR spectroscopy, the formation of chemical bonds between chitosan and dextran at the nitrogen atom has been confirmed. With the use of dynamic mechanical analysis and differential scanning calorimetry, the temperatures of...... hiện toàn bộ
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