4_2019_sen_8

Title of the article

FORMATION OF STRUCTURE OF HIGHLY FILLED UHMWPE COMPOSITES UNDER CONDITIONS OF INTENSIVE MECHANICAL ACTIVATION FOR RADIATION PROTECTIVE MATERIALS
Authors

ZHORNIK Viktor I., D. Sc. in Eng., Assoc. Prof., Head of the Laboratory of Nanostructured and Superhard Materials, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

KOVALIOVA Svetlana A., Senior Researcher of the Laboratory of Nanostructured and Superhard MaterialsSenior Researcher of the Laboratory of Nanostructured and Superhard Materials, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus

GRIGORYEVA Tatyana F., D. Sc. in Chem., Leading Researcher of the Laboratory of Chemical Materials Science, Institute of Solid State Chemistry and Mechanochemistry of the Siberian Branch of the RAS, Novosibirsk, Russia

KISELEVA Tatyana Yu., D. Sc. in Phys. and Math., Associate Professor of the Department of Solid State Physics, Lomonosov Moscow State University, Moscow, Russia

BELOTSERKOVSKY Marat A., D. Sc. in Eng., Assoc. Prof., Head of the Laboratory of Gas-Thermal Methods of Machine Components Hardening, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

TARAN Igor I., Senior Researcher of the Laboratory of Gas-Thermal Methods of Machine Components Hardening1, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus

VALKOVICH Igor V., Researcher of the Laboratory of Nanostructured and Superhard Materials1, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus

VITYAZ Petr A., Academician of the NAS of Belarus, D. Sc. in Eng., Head of the Department of Mechanical Engineering and Metallurgy1, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus

LYAKHOV Nikolay Z., Academician of the RAS, D. Sc. in Chem., Chief Researcher, Lomonosov Moscow State University, Moscow, Russia
In the section TECHNOLOGICAL MECHANICS
Year 2019 Issue 4 Pages 70–78
Type of article RAR Index UDK 621.762.2 Index BBK  
Abstract The structural changes of the ultrahigh molecular weight polyethylene (UHMWPE) filled by 70 wt.% of the ultradisperse mechanocomposites Fe/M (M = HfC (12 об.%), TiC (26 об.%), TiB2 (27 об.%), B4C (51 об.%)) and activated by the treatment in the spherical ball mill, as well as when compacting of the filled mechanically activated polymer powder by hot pressing were studied by FTIR spectroscopy. It was shown that no significant changes occur in the molecular structure of unfilled UHMWPE during mechanical treatment with a low dose of mechanical energy (Dа ≤ 0.84 kJ/g). The change of the shape of powder particles is associated with the segmental mobility of macromolecules. The introduction of the filler leads to the formation of the interphase zone “polymer–filler” with a branched polymer structure. The degree of crystallinity (χ) of mechanically activated filled polymer powders with a dose Dа = 0.21 kJ/g is decreased relative to the mechanically activated unfilled UHMWPE with a dose Dа = 0.84 kJ/g from 44 to 25–40 vol.% depending on the nature of the filler. The oxidative destruction of the polymer during mechanical activation does not occur. The degree of crystallinity of UHMWPE of filled mechanically activated powders is increased to χ = 35–45 vol.% after hot pressing, but this value is 1.6 times lower than for the compacted unfilled UHMWPE. During hot pressing, the insignificant oxidation of the polymer occurs.
Keywords

mechanical activation, mechanocomposites, ultrahigh molecular weight polyethylene, filled polymers
   
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