Papers - Archive

Nr 3/2017 - Abstracts

Elastomery nr 3/2017 cover

Ján Kruželák, Rastislav Dosoudil, Ivan Hudec

Strontium ferrite filled rubber composites based on EPDM

Strontium ferrite was compounded with ethylene-propylene-diene monomer rubber (EPDM) to prepare rubber magnetic composites. Traditional sulfur as well as peroxide curing system were applied for cross-linking of the rubber matrices. The main objective of the work was to investigate the influence of magnetic filler content and type of curing system on the cross-linking, magnetic and physical-mechanical properties of the prepared composites. The results of the study revealed that EPDM based magnetic composites can be efficiently prepared by applying of both, sulfur and peroxide curing systems. Slightly higher values of tensile strength were found to have composites cured with peroxide curing system, what can be attributed to the suitable combination of dicumyl peroxide and co-agent (i.e. ethylene glycol dimethacrylate). The application of strontium ferrite into both type composites leads to a significant improvement of the remanent magnetic induction.
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Barbara Pellizzari, Jean-Marie Dohan, Fabio Bacchelli

Sustainability in the rubber industry through bio-refinery plasticizers

The use of bio-sourced plasticizers in rubber industry to ensure the environmental sustainability of the entire production cycle was described. A new generation of plasticizers obtained from vegetable oils, commercialized under the name Matrilox®, is reported in the present paper. According to results of various tests (DSC, TGA, physical properties, aging), novel bio-sourced plasticizers, obtained through a bio-refinery approach and compounded in typical rubber formulations (NBR, SBR, BR, NR) can be successfully used as partial or total substitutes of traditional plasticizers.
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David Manas, Ales Mizera, Miroslav Manas, Pavel Stoklasek, Ivan Hudec

New apparatus for Chip-Chunk resistance testing

Wear is a phenomenon which can never be completely eliminated. It is present everywhere in all aspects of life. While the problem of wear in metal materials has been described in detail, the problem of wear in rubber products requires further investigation. Tire production is the largest sector in products made of rubber. Their wear is an important factor both for producers and users. Producers aim to produce tires with better resistance to wear than those of their competitors, while users look for a tire with the best resistance of wear. Wear is usually considered in terms of abrasion, which is defined as the loss of material that results from mechanical action on a rubber surface. Abrasion resistance is a complicated phenomenon and is dependent on many things, residence, stiffness, thermal stability, resistance to cutting and tearing, etc. and different applications require these properties in widely varying proportions. Aim of this article is to introduce the reader to the wear of off-road tires which are used in harsh terrain conditions such as quarries, construction sites or forests. For the study of such a type of wear referred to as Chip-Chunk effect improved equipment has been designed, built and verified in praxis.
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Franky Puype, Jiži Samsonek

Thermal desorption - progressive way of analytical chemistry on plastics and rubbers

Thermal desorption is defined as a sampling technology that utilizes heat to increase the volatility of analytes such that they can be removed (separated) from the solid matrix (plastics, wood, textile, extracts, foam, hair, gel, paint, etc.). Thermal desorption allows analysis of almost all sorts of materials including insoluble materials and complex materials at trace levels without any pretreatment of samples. This paper describes briefly the analytical approach of analyzing a broad range of plastic/rubber materials with thermal desorption gas chromatography coupled with mass spectrometry (TD-GC-MS).
In the paper were described available systems: direct thermal desorption, refocusing thermal desorption (cold trap), emission chamber-TD-GC-MS, Evolved-Gas-Analysis (EGA), as well as potential applications for automotive industry: additives from plastic material and rubber, volatile organic compounds (VOC/SVOC), defect analysis, liquid injections/extracts/washes.
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