Browsing by Author "Takev M."

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    Characterization of gamma irradiated polypropylene with prodegradable additive
    (2017-01-01) Velev P.; Samichkov V.; Takev M.
    Compound of polypropylene that contains 1,5 % prodegradable additive D2W has been prepared using a single screw extruder. The obtained blend was grinded and injected in the form of standard specimens for tensile testing. The samples thus manufactured were irradiated with different dosage of gamma radiation up to 476 kGy. The physical, mechanical, and rheological characteristics such as tensile strength, relative elongation and melt flow index were determined in accordance with the radiation dosage applied. The effect of the gamma radiation on the structure of the oxo degradable polypropylene was examined by IR spectroscopy and X-ray diffraction analysis.
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    Investigation of the biodegradability of polymer blends consisting of polypropylene and Poly(lactic acid)
    (2015-01-01) Velev P.; Samichkov V.; Takev M.
    Foils from oxo-degradable polypropylene and poly(lactic acid) in various ratios were prepared, using a single screw extruder and a three-roll calender. The samples of the blend were subjected to aging in natural conditions and to biodegradation in composting conditions. The intensity of biodegradation of the various components was investigated through the change in tensile strength and elongation at break, as well as through Fourier transform infrared spectroscopy. It was established that the blends obtained from both polymers degraded in composting conditions, and it was possible to control the polylactide degradation and to obtain the required properties of the final products by varying the polypropylene content in the blend.
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    Physicomechanical properties of biodegradable composites, based on polypropylene and paper from old newspapers
    (2014-01-01) Takev M.; Velev P.; Samichkov V.
    This paper examines the main physical and mechanical properties ofaged and non-aged polymer composites made of a matrix filled with 10% fiberized or chopped old newspaper oxo-degradable into polypropylene. The impact of the modification of the filler with a polyvinyl acetate water dispersion and with carboxymethyl cellulose on the properties of the extrudedflatfoil made of composites was studied. Adding a lignocellulosefiller worsens the properties of the products obtained, but significantly accelerates the degradation of the composite material. The used filler modifiers improve the examined physical and mechanical properties, but increase the weather resistance of the foil products.