Papers - Archive

Nr 3/2013 - Abstracts

Elastomery nr 3/2013 cover

Władysław M. Rzymski

Natural rubber: about its history, situation nowadays and in a future. Selected problems

Based on review of literature and internet data, the history of wild and plantation natural rubber, its origin, sources of gain, including special events and moments, changes of its price over years as well are presented. Apart from development in world and local economy and in producer’s countries, problems connected with its potential diseases, natural rubber will be very important factor influencing the future of elastomer’s market and rubber industry, and automobile industry as well.

Janka Kubačková, Jozef Feranc, Ivan Hudec, Štefan Šutý, Michal Jablonský, Július Annus, Jozef Preťo

Antioxidant properties of lignin in rubber blends

The present work studied the antioxidant properties of different lignin samples in carbon black filled NR/SBR blends. The commercial calcium lignosulfonate and two types of lignins with different botanical origin which were isolated from black liquors using diluted sulfuric acid were used. The lignin samples were characterized in terms of the elemental analysis and FTIR spectroscopy. The content of phenolic hydroxyl groups of each sample was determined using UV spectroscopy. Efficiency of these "natural stabilizers" was compared with common used rubber stabilizer N-isopropyl-N'-phenyl-p-phenylene diamine (IPPD). Rubber vulcanizates with addition of chosen stabilizers were submitted to accelerated thermo-oxidative aging for 72 and 168 hours and the mechanical properties of prepared vulcanizates before and after aging were measured. The obtained results showed that lignin exhibits stabilizing effect in tested rubber blends and its effect is comparable with conventional antioxidant IPPD. However, it was revealed that stabilizing effect depends greatly on total content of phenolic hydroxyl groups. Moreover, the amount of phenolic structures significantly influences antioxidant properties of lignins in mixtures with IPPD.

Yu.O. Andriasyan, I.A. Mikhaylov, A.L. Belousova, G.E. Zaikov, A.E. Kornev, A.A. Popov

Properties and application of polyolefin chlorine-containing rubbers, obtained by mechanochemical halide modification method

The new alternative technology of obtaining chlorine-containing elastomers, based on solid phase (mechanochemical) halide modification was created taking into account current requirements. New chlorine-containing polyolefin cauotchoucs, obtained by given technology, showed yourself to good advantage in condition of rubber’s production.

Zbigniew Czech, Dominika Sowa, Jagoda Kowalska, Paulina Ragańska

Pyrolysis of methacrylic polymers

The methacrylic polymers based on poly(alkyl methacrylates) are important specialty polymers. They are very interesting for adhesive applications, characterized by excellent compatibility with acrylic, methacrylic and with wide range of other polymers. They can be used especially for modification of aqueous acrylic and methacrylic dispersions, and for manufacturing of polymeric films. These polymers display several unique properties, such as extremely good weather and aging resistance, non yellowing properties, low permeability of oxygen, and good plasticizers resistance. The thermal behavior of methacrylic copolymers has been the target of some reports. During the pyrolysis of methacrylic polymers were observed such kinds of products, as alkyl methacrylates, carbon dioxide, carbon monoxide, methane, ethane, methanol, ethanol and propanol.

Paulina Dmowska, Władysław M. Rzymski

Dynamic crosslinking and properties of chloroprene and hydrogenated acrylonitrile-butadiene rubber blends

Properties of blends containing special chloroprene rubber (CR) with specialty, partially hydrogenated acrylonitrile-butadiene rubber (HNBR) were studied. Blends were prepared by reactive processing combined with dynamic, selective thermocuring of CR. Mechanical properties, blends morphology by AFM method and crosslinking degree based on equilibrium swelling in selected solvents were studied. CR/HNBR blends are characterized by significant tensile strength, increasing with CR content in the blends. AFM images confirmed droplet dispersion of CR in the matrix of HNBR in blends contain more than 65 phr of HNBR.
Crosslinking degree of blends depends on amount of CR in the blends. The higher CR content caused the higher crosslinking degree. Blends containing more than 45 phr of CR are characterized by significantly processing shrinkage, due to crystallisation of CR.

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