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Polymerization of olefins catalyzed by a dichloride complex of titanium with a dioxolane dicarbonate ligand: The promoting effect of LiCl and MgCl2
Pleiades Publishing Ltd - Tập 53 - Trang 42-51 - 2011
L. A. Rishina, N. M. Galashina, S. Ch. Gagieva, V. A. Tuskaev, Y. V. Kissin
The polymerizations of propylene and ethylene with two postmetallocene catalysts [(4R,5R)-2,2-dimethyl-α,α,α′,α′-tetra(perfluorophenyl)-1,3-dioxolane-4,5-dimethanol]TiCl2 · MgCl2 and [(4R,5R)-2,2-dimethyl-α,α,α′,α′-tetra-(perfluorophenyl-1,3-dioxolane-4,5-dimethanol]TiCl2· (LiCl)2 are studied. The first catalyst shows higher activity in both reactions and forms a lower molecular mass PP. This PP i... hiện toàn bộ
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 determined by quenching by radioactive carbon monoxide (14CO). It was found that the drop in activity during polymerization... 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
Hydrolysis of polyacrylonitrile in aqueous solution of sodium carbonate
Pleiades Publishing Ltd - Tập 54 - Trang 161-166 - 2012
V. A. Dyatlov, T. A. Grebeneva, I. R. Rustamov, A. A. Koledenkov, N. V. Kolotilova, V. V. Kireev, B. M. Prudskov
The kinetics of homogeneous hydrolysis of polyacrylonitrile in an aqueous solution of sodium carbonate and the chemical structure of the resulting copolymer are studied by FTIR spectroscopy, 13C NMR analysis, and titration methods. It is found that hydrolysis in the presence of sodium carbonate does not include the stage of amidine formation and does not result in the complete exhaustion of nitril... hiện toàn bộ
Synthesis and characterization of aliphatic-aromatic copolyesters based on Cis-1,3-indanediol
Pleiades Publishing Ltd - - 2013
Hind Guemmour, Ahmed Benaboura
Photoluminescent phenylated polyfluorenes synthesized in an organic solvent and supercritical carbon dioxide
Pleiades Publishing Ltd - Tập 54 - Trang 106-114 - 2012
M. L. Keshtov, E. I. Mal’tsev, A. M. Lopatin, L. N. Nikitin, D. V. Marochkin, V. P. Perevalov, P. V. Petrovskii, A. R. Khokhlov
A number of new phenylated polyfluorenes with blue emission are synthesized via the Diels-Alder reaction in chloronaphthalene and supercritical carbon dioxide. It is shown that these polymers are thermally stable. A comparative analysis of their properties shows that a “green” solvent is a suitable alternative to organic solvents for obtaining phenyl-substituted polyfluorenes via the Diels-Alder r... hiện toàn bộ
Pyrolysis Behavior of Ester Substituted Poly(p-phenylene)s and Determination of Its Microstructural Arrangement through TGA
Pleiades Publishing Ltd - Tập 63 - Trang 358-366 - 2021
Danbo Mao, Yuechuan Wang
Four 2,5-dicholorobenzoate monomers were prepared by chlorination and esterification and then polymerized to ester substituted poly(p-phenylene)s through Ni/Zn catalyzed coupling reaction. The thermal stability and pyrolysis behavior of ester substituted poly(p-phenylene)s were investigated through TGA method. The possible mechanism of thermal modification of the polymers was proposed that include... 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
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