INFLUENCE OF MECHANICAL ACTIVATION ON STRUCTURE OF COMPOSITE POWDERS BASED ON ULTRAHIGH-MOLECULAR WEIGTH POLYETHYLENE FILLED BY BORON CARBIDE
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Abstract
The products of mechanical alloying (MA) of a powder mixture of ultrahigh-molecular weight polyethylene and microcrystalline boron carbide (B4C) produced in the high-energy spherical planetary mill during with an energy density I = 1.1 W/g for a duration of 5 up to 25 minutes were studied by the methods of X-ray diffraction, scanning electron microscopy and FT-IR spectroscopy. It is shown that the polymeric composite particles of flake form of a size of 100…160 μm with a chaotic distribution in them of the boron carbide particles of size of 1…5 μm are formed during mechanical alloying. Oxidative degradation of the polymer is not observed. MA promotes the formation of a boron carbide structure with a lower carbon content (B6.5C). The main possible results of the interaction of the polymer matrix and dispersed filler powders in MA are the cross-linking processes with some possible decrease in its molecular weight.
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References
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