Papers - Archive

Nr 1/2013 - Abstracts

Elastomery nr 1/2013 cover

Małgorzata Nachman, Konrad Kwiatkowski, Zbigniew Rosłaniec

Influence of the composition of EPDM rubbers to their resistance to light

Rubber compounds based on EPDM rubber with different content of components were obtained and studied. For the preparation of the rubber compounds two types of EPDM rubber containing different amounts of ethylene and ethylidene norbornene and two types of plasticizers: naphthenic oil and paraffin-naphthenic-aromatic oilhave been used. The rubber compound with two kinds of antioxidants: steric hindered phenol derivative (BHT) and a mixture 2-mercaptobenzimidazole with alkylene alkylphenol derivative (Nonox CNS) have been studied too. The rubber compound were prepared using a laboratory mill and vulcanized in press. Accelerated aging tests for rubber samples were used.
Weather meter (Xenotest) was determined using to the accelerated light ageing tests. In this paper, evaluated the effect of the type of oil, the antioxidant, and the type of EPDM on the discoloration by the action of light.

Joanna Kleczewska, Dariusz Bieliński, Małgorzata Piotrowska, Jacek Jagielski

Influence of high energy Ion bombardment on mechanical properties and microbiological resistance of natural rubber vulcanizates. Part I. He+ and Ar+ ion beam treatment

The paper discusses the influence of high energy helium or argonium ions bombardment, applied to natural rubber vulcanizates, on their surface energy, mechanical, and microbiological properties. The influence of the modification is the highest for carbon black filled vulcanizates, no matter the applied crosslinking system. Independently on the kind and dose of ions it manifests itself by more than twice increase of the tensile strength of rubber. In all the cases, ion bombardment results in about twice reduction to the surface energy of the vulcanizates studied, leading simultaneously to significant increase of its polar component content. Only peroxide crosslinked vulcanizates demonstrate some antibacterial activity towards Gram+ species. In general, ion bombardment does not improve bacterial resistance of the vulcanizates. They do not present fungistatic properties. Ion bombardment does not influence significantly the amount of fungi being created on surface of the vulcanizates.

Aneta Stępkowska, Teresa Parys, Teresa Kleps

The application of the HPLC technique to control and evaluation of chemical hazard by polycyclic aromatic hydrocarbons (PAHs) coming from the rubber articles

The article describes the problems connected with chemical security of rubber composites goods, especially contacted with food and human body. This can be done by the analytical control presence in them carcinogenic polycyclic aromatic hydrocarbons (PAHs). Emission of the PAHs from rubber products should be monitored and reduced in accordance to directives of the European Union. The testing and control of releases PAHs are especially significant from environment pollution and human healthy view point. In some area like food, water intended for drinking, waste water and soil exist legal provision ordering determining and monitoring level of the PAHs. Rubber goods, also intended to come into contact with food and human body, not have now specific about presence of the PAHs requirements in them and there are not the standard test procedures for them determination in elastomers.
The subject of the work is elaborate the test procedure for the identification and quantitative evaluation of PAHs in elastomer composites by HPLC method connected with fluorescence detection technique FLD, in accordance with EU standard. By exploring of this procedures we tested oil-extended styrene-butadiene rubbers (SBR) and research of selected rubber products in the form of chews and toys for infants and young children. Dispatching of PAHs analytical technique, in accordance with requirements of the international standard let us to provide research works connected with monitoring of risk created by carcinogenic polycyclic aromatic hydrocarbons (PAHs) coming from the rubber products. Such data are necessary needed for ensuring the chemical safety of rubber products users against harmful effects of PAHs.

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