Papers - Archive

Nr 2/2017 - Abstracts


Elastomery nr 2/2017 cover

Marcin Włoch, Paulina Kosiorek, Kamila Błażek, Janusz Datta

Mechanical and thermo-mechanical properties of natural rubber composites filled with submicron and nano-sized silica particles and prepared using glycolysate as a plasticizer

The main aim of this work was to examine the selected mechanical and thermo-mechanical properties of natural rubber/silica composites prepared using glycolysate as a plasticizer. Prepared composites contained different amounts of submicron- (10, 15, 20 or 25 pphr) or nano-particles (0.5, 0.75, 1.0 or 1.25 pphr). The tensile properties, tear resistance, hardness, abrasion resistance and resilience of prepared materials were determined. In addition, the thermo-mechanical properties (by Dynamic Mechanical Thermal Analysis) were determined for the samples characterized by the highest content of particulate filler. All results were compared with properties of reference samples (without silica particles).
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Elżbieta Piesowicz, Izabela Irska, Zbigniew Rosłaniec

EPDM/EVA thermoplastic vulcanizates (TPV) - effect of vinyl acetate content and oil extension on blend properties

Rubber compounds based on EPDM rubber and thermoplastic component - olefin copolymer-ethylenevinyl acetate (EVA) were prepared. All blends were prepared in one-step by continuous extrusion process. Present study deals with the effect of component ratio and oil extension on the properties of mentioned systems. In addition, the effect of vinyl acetate (VA) content on EPDM/EVA blend properties was studied to investigate the change in the extent of the modification. The mechanical properties were evaluated by tensile and hardness tests. The influence of composition on tribological properties was examined. Dynamic mechanical analysis (DMA) measurements were conducted, for the purpose of structure evaluation. The materials were prepared and tested for their potential use as sport surfaces and technical products.
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Davlatbek Turganbekovich Khojibergenov, Dariusz Krzysztof Chmura, Nikolay Nikolayevich Zobnin, Kairat Muhanmetkulovich Islamkulov

Self-tapping screw surface gas-phase cementation kinetics investigation, with EPDM washer

The kinetics of gas-phase cementation of goods - self-tapping metal screws for attachment of metal structures DIN 7982 / ISO 7050 with pointed ends from steels of SAE 1013-1018 to ASTM 510 grades was studied. The investigation was carried out by dynamic method with open volume, renewable gas phase, continuous delivery of natural gas to the flow system and its extraction from gaseous products of interaction. Chemical and phase composition of the surface coating was studied by means of low-vacuum raster electron microscope JSM 6490LV of JEOL company (Japan). A cementation of screws with washer from EPDM was examined. Experimental dependences of carbon concentration on the distance from the goods' surface for various exposures in the cementation process were received. It was found that hardness of all elements of the hardened goods is notably higher than of the hardened goods. Thread, head and drill, i.e. off set elements of the goods are subjected to the maximum hardening. It was also substantiated that there is substantial decarbonization of the surface coating at a depth of 0.2-0.4 mm depending on the exposure time in the process of traditional hardening heat of the self-tapping screws. This explains lower values of the hardness of the thread, head and drill, the protruding elements of the goods. In comparison with the hardening, the cementation allows raise the hardness of the surface to 64?73 HRC (hardness in Rockwell scale C). Ways to raise corrosion resistance using the cementation were aimed. Among goods with protective coating (galvanized, oxidized) at the initial stage, the case-hardened goods have the lowest weight loss and during the whole time of the experiment the weight loss is substantially lower than the standard values.
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Raisa M. Dolinskaya, Nikolay R. Prokopchuk

The modification of polyolefin compositions based on thermoplastics

Influence of the nature and the behavior of nanofillers and microfillers on rheological and physico-mechanical properties of compositions on the basis of a polyolefin thermoplastic elastomer (ethylene-octene block copolymer) is studied. It is shown that modifying of a thermoplastic elastomer with nano- and microparticles of various chemical nature influences the structure and physico-mechanical properties of compositions: increases tensile strength, tear resistance, fatigue endurance at repetitive stretching, Shore A hardness.
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