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T. A. Okhlopkova,R. V. Borisova,L. A. Nikiforov,A. M. Spiridonov,A. A. Okhlopkova,정대용,조진호 대한화학회 2016 Bulletin of the Korean Chemical Society Vol.37 No.4
We investigated the mechanical properties and structure of polymeric nanocomposites (PNCs) with an ultrahigh-molecular-weight polyethylene (UHMWPE) matrix and aluminum and silicon oxide and nitride nanoparticle (NP) fillers. Mixing with a paddle mixer or by joint mechanical activation in a planetary mill was used for the PNC preparation. Joint mechanical activation afforded PNCs with better mechanical properties than paddle mixing. Scanning electron microscopy suggested that the poorer mechanical properties can be attributed to the disordered regions and imperfect spherulites in the PNC supramolecular structure arising from paddle mixing. The better mechanical properties observed with joint mechanical activation may derive from the uniform NP distribution in the polymer matrix and absence of disordered regions.
Okhlopkova, A.A.,Sleptsova, S.A.,Alexandrov, G.N.,Dedyukin, A.E.,Shim, Ee Le,Jeong, Dae-Yong,Cho, Jin-Ho Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.5
We investigated the tribochemical and wear properties of Polytetrafluoroethylene (PTFE) based polymer matrix composites with nanoceramic (NC) ${\beta}$-sialon, and $Al_2O_3$ particles for the mechanical seal applications at low temperature. SEM showed that NC particles were homogeneously distributed in the polymer matrix and initiated the formation of the supramolecular spherulites around NC. From the temperature stimulated depolarization (TSD) current results, it was analyzed that the surface charge on nanoceramic affected the formation of the spherulites structure. 2 wt % $Al_2O_3$ NC did not degrade the mechanical properties of PTFE so that composites showed the similar values of tensile strength, elongation at the rupture and friction coefficient as those of neat PTFE. However, the composite with 2 wt % $Al_2O_3$ NC revealed the improved wear resistance, wear rate of 0.4-1.2 mg/h at room temperature and 0.28 mg/h at $-40^{\circ}C$, respectively, while the neat PTFE the 70-75 mg/h at room temperature and 70.3 mg/h at $-40^{\circ}C$.
A. A. Okhlopkova,S. A. Sleptsova,G. N. Alexandrov,A. E. Dedyukin,심이레,정대용,조진호 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.5
We investigated the tribochemical and wear properties of Polytetrafluoroethylene (PTFE) based polymer matrix composites with nanoceramic (NC) β-sialon, and Al2O3 particles for the mechanical seal applications at low temperature. SEM showed that NC particles were homogeneously distributed in the polymer matrix and initiated the formation of the supramolecular spherulites around NC. From the temperature stimulated depolarization (TSD) current results, it was analyzed that the surface charge on nanoceramic affected the formation of the spherulites structure. 2 wt % Al2O3 NC did not degrade the mechanical properties of PTFE so that composites showed the similar values of tensile strength, elongation at the rupture and friction coefficient as those of neat PTFE. However, the composite with 2 wt % Al2O3 NC revealed the improved wear resistance, wear rate of 0.4-1.2 mg/h at room temperature and 0.28 mg/h at −40 oC, respectively, while the neat PTFE the 70-75 mg/h at room temperature and 70.3 mg/h at −40 oC.
Shadrinov, Nikolay V.,Sokolova, Marina D.,Okhlopkova, A.A.,Lee, Jungkeun,Jeong, Dae-Yong,Shim, Ee Le,Cho, Jin-Ho Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.12
This article examines the modification of surface properties of ultrahigh-molecular-weight polyethylene (UHMWPE) with nanoscale ceramic particles to fabricate an improved composite with butadiene-nitrile rubber (BNR). Adhesion force data showed that ceramic zeolite particles on the surface of UHMWPE modulated the surface state of the polymer and increased its compatibility with BNR. Atomic force microscopy phase images showed that UHMWPE made up the microphase around the zeolite particles and formed the evolving layer with a complex interface. The complex interface resulted in improvements in the mechanical properties of the composite, especially its low-temperature resistance coefficients, thereby improving its performance in low-temperature applications.
Argunova, Anastasiia G.,Petrova, Pavlina N.,Okhlopkova, Aitalina A.,Shadrinov, Nikolay V.,Gogoleva, Olga V.,Cho, Jin-Ho Korean Chemical Society 2015 대한화학회지 Vol.59 No.3
The effect of ultrasonication on PTFE and its composites with zeolite and fluoroplast F-4NTD-2 was studied. Ultrasonication was found to cause changes in the supramolecular structure, and consequently, the tensile strength, relative elongation, and mass wear rate. Changes in the topology of the materials following ultrasonication were investigated by scanning electron microscopy. The optimum enhancement of the desired properties was found in the PTFE composite containing 2% activated zeolite.
Kirillina, Iu.V.,Nikiforov, L.A.,Okhlopkova, A.A.,Sleptsova, S.A.,Yoon, Cheonho,Cho, Jin-Ho Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.12
Deficiencies in wear and frost resistance as well as mechanical strength constitute the main causes of equipment failure under the harsh climatic conditions of the Earth's polar regions. To improve the properties of the materials used in this equipment, nanoparticle composites have been prepared from clays such as kaolinite, hectorite, and montmorillonite in combination with polytetrafluoroethylene (PTFE) or ultrahigh molecular weight polyethylene (UHMWPE). A number of techniques have been proposed to disperse silicate particles in PTFE or UHMWPE polymer matrices, and several successful processes have even been widely applied. Polymer nanocomposites that exhibit enhanced mechanical and thermal properties are promising materials for replacing metals and glass in the equipment intended for Arctic use. In this article, we will review PTFE- and UHMWPE-based layered silicate nanocomposites.
Reinforcement of Polyethylene Pipes with Modified Carbon Microfibers
Petukhova, E.S.,Savvinova, M.E.,Krasnikova, I.V.,Mishakov, I.V.,Okhlopkova, A.A.,Jeong, Dae-Yong,Cho, Jin-Ho Korean Chemical Society 2016 대한화학회지 Vol.60 No.3
The surface properties of carbon microfibers (CMFs) are modified by chemical deposition of carbon nanofibers via the so-called ethylene processing. CMFs and the modified CMFs (MCMFs) are investigated as reinforcement additives to fabricate polyethylene (PE) composites with enhanced mechanical characteristics. The mechanical properties of the PE-MCMF composites are found to be better and favorable for applications under harsh climatic conditions such as those in Siberia. Improved adhesive interaction between MCMFs and PE is responsible for these enhanced mechanical properties.
Nikolay V. Shadrinov,Marina D. Sokolova,A. A. Okhlopkova,Jungkeun Lee,정대용,Ee-Le Shim,조진호 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.12
This article examines the modification of surface properties of ultrahigh-molecular-weight polyethylene (UHMWPE) with nanoscale ceramic particles to fabricate an improved composite with butadiene–nitrile rubber (BNR). Adhesion force data showed that ceramic zeolite particles on the surface of UHMWPE modulated the surface state of the polymer and increased its compatibility with BNR. Atomic force microscopy phase images showed that UHMWPE made up the microphase around the zeolite particles and formed the evolving layer with a complex interface. The complex interface resulted in improvements in the mechanical properties of the composite, especially its low-temperature resistance coefficients, thereby improving its performance in low-temperature applications.
Effect of Carbon Black Activation on Physicomechanical Properties of Butadiene-nitrile Rubber
N. V. Shadrinov,E. A. Kapitonov,M. D. Sokolova,A. A. Okhlopkova,심이레,조진호 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.10
The effects of mechanical activation of carbon black on the processing and properties of butadiene nitrile rubber were studied. Mechanical activation of carbon black caused an improvement in the physical and mechanical properties of the butadiene-nitrile rubber, BNR-18AMN. The optimum activation time that would afford rubber with improved properties was established.
Effect of Carbon Black Activation on Physicomechanical Properties of Butadiene-nitrile Rubber
Shadrinov, N.V.,Kapitonov, E.A.,Sokolova, M.D.,Okhlopkova, A.A.,Shim, Ee Le,Cho, Jin-Ho Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.10
The effects of mechanical activation of carbon black on the processing and properties of butadiene nitrile rubber were studied. Mechanical activation of carbon black caused an improvement in the physical and mechanical properties of the butadiene-nitrile rubber, BNR-18AMN. The optimum activation time that would afford rubber with improved properties was established.