Papers - Archive

Nr 2/2013 - Abstracts

Elastomery nr 2/2013 cover

Ryszard Michał Kozłowski, Zbigniew Wertejuk, Małgorzata Muzyczek

Fire retardancy of flammable materials

The review article consist data connected with flame and fire retardancy of different materials, including polymers, composites, wood, and wooden products, fibres and textiles [1,2]. In paper are presented different mechanisms of flame retardancy, which is classified into 4 different groups. These mechanisms rely on: physical dilution of flammable gases, by inflammable gases, and braking the free-radical reaction of flame, chemical intrinsically built non-flammable structures in structure of polymers, insulation, and reflection of heat transfer, application of protective, especially intumescent coatings. Flame retardants, used and produced in global scale, generally are based on aluminium oxide, magnesium oxide, antimony oxide, chlorine and bromine compounds, melamine and their relatives, phosphorus compounds, boron compounds, graphite, graphen, carbon nano-tubes and aluminum silicates. The main area of their application are polymers and composites, wood and wooden products, paper, fibres and textiles, paints, and varnishes and fire retardant coatings e.g. intumescent also for steel and wood constructions. The nano-flame retardants, introduced recently allow for decreasing their dose, even below 3% of their mass. In the most of the world countries, in different area of economy, there are standards to obey, regarding using of flame retardants e.g. ISO standards and domestic in particular countries, mainly due to the existing problems with toxic properties of flame retardants and with recycling of products, which consist flame retardants.

A.A. Ol'khov, A.L. Iordanskii, G.E. Zaikov

Structural features of poly(3-hydroxybutyrate) with an ethylene-propylene copolymer blends

The methods of DSC and IR spectroscopy were used to study various blends of poly(3-hydroxybutyrate) (PHB) with ethylene-propylene copolymer rubber (EPS). When the weight fractions of the initial polymers are equal, a phase inversion takes place; as the blends are enriched with EP, the degree of crystallinity of poly(3-hydroxybutyrate) decreases. In blends, the degradation of poly(3-hydroxybutyrate) begins at a lower temperature compared to the pure polymer and the thermooxidative activity of the ethylene-propylene copolymer in the blend decreases in comparison with the pure copolymer.

Rafał Anyszka, Dariusz M. Bieliński, Monika Kowalczyk

Influence of dispersed phase selection on ceramizable silicone composites cross-linking

In this work influence of selected mineral fillers on peroxide cross-linking of ceramizable silicone composites is presented. Changes to vulcanization kinetic and vulcanization parameters of mixes were measured under environmental conditions similar to storage.Risk associated with using alkaline fillers and aluminosilicate layered clays modified with quarternary ammonium salts from the point of view of peroxide mixes curing was indicated.

Krzysztof Potocki

Influence of carbon black modification on rheological properties of SBR compounds

This articles continues investigations in the field of channel black modification for the purpose of improvement of mechanical properties of SBR vulcanizates. It describes the results of investigations that were undertaken to determine the influence of carbon black modification on physical properties of SBR compounds. Channel black was modified by N-2-aminoethyl-3-aminopropyl-trimethoxysilane, γ-methacryloxy-propyl-trimethoxysilane and diethylentriamine. Physical properties such as Mooney viscosity and relaxation were investigated. On the basis of the results it has been observed that SBR compounds containing channel black modified by N-2-aminoethyl-3-aminopropyl-trimethoxysilane show much bigger viscosity than other compounds with unmodified black and modified by other modificators.

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