16 Result(s)

Article

Modification of Properties of Composites Based on Ultra-High Molecular Weight Polyethylene by Creating Two-Layer Coatings with Low Molecular Weight Polyethylene on Filler Particles: Synthesis, Properties, and Application in 3D Printing by Selective Laser Sintering

Composites with a two-layer coating consisting of ultra-high molecular weight polyethylene and a lower molecular weight high-density polyethylene are synthesized by the sequential two-step polymerization of et...

S. S. Gusarov, O. I. Kudinova, I. A. Maklakova, N. G. Ryvkina… in Polymer Science, Series B (2023)

Article

Modifying Effect of Polyethylene Fractions of Different Molecular Weights on the Morphology and Properties of Reactor Polymer Compositions Based on Ultrahigh Molecular Weight Polyethylene

Reactor polymer compositions (RPCs) based on UHMWPE with M_w = 1000 kg mol^–1 and low molecular weight HDPE (LMWPE) were studied. Two series of UHMWPE compositions were used to determine the influence of the molecu...

S. S. Gostev, E. E. Starchak, T. M. Ushakova, V. G. Grinev… in Polymer Science, Series A (2023)

Article

Highly Filled Composite Materials Based on UHMWPE and a Mixture of Micron and Nanoscale Aluminum Particles

Highly filled (up to 90 vol %) UHMWPE composites with Al of controlled dispersed composition (micro-, nanoparticles, and their mixtures) were obtained by the polymerization filling method. The use of a mixture...

O. I. Kudinova, P. A. Nezhnyi, V. G. Grinev… in Russian Journal of Physical Chemistry B (2022)

Article

The Effect of Filler Type on the Mechanical Properties of Composite Materials Based on Ultra-High-Molecular-Weight Polyethylene

The effect of the filler type (graphite nanoplates, organomodified montmorillonite, molybdenum disulphide, or shungite) on the deformation and strength properties of composite materials based on UHMWPE synthes...

V. G. Grinev, V. G. Krasheninnikov, A. S. Zabolotnov… in Polymer Science, Series D (2018)

Article

Oxidation of Aluminum in Mixtures with Polyethylene after Plastic Deformation at High Pressures

Powder mixtures of low-density polyethylene and aluminum with the 20–80% weight ratio of the species are subjected to plastic deformation at pressures of 1 and 4 GPa in high-pressure devices of the Bridgman an...

V. A. Zhorin, M. R. Kiselev, A. V. Grachev… in Combustion, Explosion, and Shock Waves (2018)

Article

Synthesis of isotactic polybutene-1 over titanium-magnesium catalysts with polydentate phosphine oxides as external electron donors

The polymerization of 1-butene over the TiCl₄/MgCl₂ (TMC) catalyst with the use of substituted phosphine oxides R _n P(O)(CH₂OR′)_{3 − n} (R = alkyl, R′ = methyl or ...

O. I. Kudinova, V. G. Krasheninnikov, A. A. Samoilenko… in Kinetics and Catalysis (2013)

Article

Polydentate phosphine oxides as external electron donors for titanium-magnesium catalysts for propylene polymerization

The possibility of using R _n P(O)(CH₂OR′)_3—n (R = alkyl, R′ = methyl or acyl, n = 0–2) polydentate phosphine oxides as external electron donors for the t...

O. I. Kudinova, T. E. Kron, T. A. Ladygina, A. N. Kozhevnikov… in Kinetics and Catalysis (2010)

Article

Effect of the zeolite support on the polymerization of propylene with immobilized ansa-zirconocene catalysts

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: ...

I. N. Meshkova, O. I. Kudinova, N. Yu. Kovaleva, V. G. Grinev… in Polymer Science Series B (2009)

Article

Modification of polyolefins as a modern strategy to designing polyolefin materials with a new complex of properties

Experimental data on multistage catalytic olefin polymerization processes are generalized. Such processes as the sequential homo-and copolymerization of ethylene and α-olefins; the copolymerization of ethylene...

I. N. Meshkova, T. M. Ushakova, N. M. Gul’tseva, V. G. Grinev… in Polymer Science Series A (2008)

Article

Polymer materials based on ethylene copolymers with substituted norbornene

The copolymers of ethylene with 5-ethylidene-2-norbornene containing 10–65% of the cyclic comonomer have been prepared with the use of three ansa-metallocene catalysts, namely, Et[Ind]₂ZrCl₂-methylaluminoxane, Et...

I. N. Meshkova, V. G. Grinev, E. V. Kiseleva, L. N. Paspopov… in Polymer Science Series A (2007)

Article

Olefin polymerization on immobilized zirconocene catalysts containing alkylaluminoxanes synthesized on the support surface

Ethylene and propylene polymerization on immobilized catalysts of composition MMT-H₂O/AlR₃/Zr-cene (MMT = montmorillonite) and on the corresponding homogeneous catalysts of composition Zr-cene-MAO (Zr-cene = rac-...

T. M. Ushakova, M. V. Lysova, O. I. Kudinova, T. A. Ladygina… in Kinetics and Catalysis (2007)

Article

Heterogenized methylaluminoxane and isobutylaluminoxane as activators for metallocene catalysts

Heterogenized alkylaluminoxanes prepared in situ on the montmorillonite (MMT) surface by the partial hydrolysis of AIR₃ with water of the support are effective activators for metallocenes. The thermal destruction...

L. A. Novokshonova, T. M. Ushakova, V. G. Krasheninnikov… in Kinetics and Catalysis (2006)

Article

Partially Hydrolyzed Alkylaluminums as the Active Heterogenized Components of Metallocene Catalysts

The heterogenized reaction products of the partial hydrolysis of the organoaluminum compounds AlMe₃ and Al(i-Bu)₃ with water as a constituent of highly hydrated supports, zeolite (ZSM-5-H₂O) and montmorillonite (...

L. A. Novokshonova, N. Yu. Kovaleva, T. M. Ushakova… in Kinetics and Catalysis (2005)

Article

Ethylene polymerization with catalysts on the base of Zr-cenes and methylaluminoxanes synthesized on zeolite support

I. N. Meshkova, T. M. Ushakova, T. A. Ladygina, N. Yu. Kovaleva… in Polymer Bulletin (2000)

Article

Influence of the catalyst matrix structure of the supported Ziegler-Natta catalysts on the homo- and copolymerization of olefins

The vanadium catalytic complexes immobilized on the same support (aluminium hydroxide, AH) and distinguished by structure and composition have been compared for ethylene and propylene homo- and copolymerizatio...

I. N. Meshkova, T. M. Ushakova, N. M. Gul’tseva, M. N. Larichev… in Polymer Bulletin (1997)