Papers - Archive

Nr 4/2014 - Abstracts

Elastomery nr 4/2014 cover

Helena Janik, Kaja Borzędowska, Maciej Sienkiewicz

Modification of tribological properties of polyurethanes

The following paper presents methods of modification of tribological properties of polyurethanes and polyurethane composites and testing methods of tribological properties of these materials. Wear resistance and abrasion were compared for all materials described in the paper. Potential causes of changes in the properties was also discussed. Polyurethanes and polyurethane composites were presented depending on the type of reinforcement. Polymer-filled composites (UHMWPE, PA 11, PTFE, phenolic resin) and inorganic-filled composites (TiNTs, TiNTs-HDI, nano-ZnO, GF, CF, CF-TDI, MWCNTs, MWCNTs-TDI, nano-SiO2) were characterized. Addition of a suitable filler to the polyurethane elastomer causes a reduction in the friction coefficient by several times. Lowering the parameter ľ can also be obtained by lubricating opponent body (water, sea water, oil). Tribological properties of selected materials vary depending on the operating conditions (FN parameter, friction rate, time of the measurement), the size and shape of the particles.

Mateusz Imiela, Rafał Anyszka, Dariusz M. Bieliński

Ceramizable polymer composites

In this article a review of current state of informationin field of ceramizable polymer composites has been presented. Ceramization process is used in the preparation of composites which present increased resistance against fire and high temperatures. The most commonly used polymers for preparing continuous phase are silicone rubbers which, in comparison to other common elastomers, exhibit high thermal stability. Proper selection of fillers assures increase of mechanical properties of composites, improves their thermal resistance and barrier properties as a result of creation of robust ceramic phase during firing of a composite. So far there hasn't been done many research concerning preparation of ceramizable composites on a base of different polymers than silicone rubber.

Zbigniew Czech, Jagoda Kowalska, Paulina Ragańska, Adrian Krzysztof Antosik

Application of excimer-laser for crosslinking of acrylic PSA

The synthesis and properties of photoreactive solvent-based acrylic pressure-sensitive adhesives (PSA) containing, incorporated during radical solvent polymerization unsaturated photoinitiators, such as 4-acryloyloxy benzophenone (ABP), 4-acryloyloxyethoxy benzophenone (AEBP) and phenyl-(1-acryloyloxy)cyclohexyl ketone (PAC), were investigated. The synthesized UV-crosslinkable acrylic PSA were coated with 60 g/m2 coat weight on polyester film and after drying 10 min at 110°C in drying canal crosslinked by the use of spectral UV-lamp emitted UV-C radiation. These samples were compared with samples crosslinked using monochromatic UV excimer-laser It was observed that after UV crosslinking of acrylic PSA using excimer-laser in comparison with typical UV-C lamp, high quality PSA products with excellent properties, such as tack, peel adhesion, shear strength and shrinkage, were manufactured.

Andrzej Niemierko

Elastomeric bearings used in bridge construction

Introduction of elastomer to the construction of bridge bearings at latest 50-ies of last century had great influence on amelioration of bridge spans supporting condition. Thanks to that their installation and maintenance was also easier. First the basis of theoretical and design considerations for elastomeric bearings reinforced with steel plates were presented. Then the world and Polish history of elastomeric bearings development in bridge construction was shortly described.

Maria Rajkiewicz, Jakub Czakaj

The use of rubber reclaim in butyl sealants

Reclaimed and ground rubber was used as a substitute of isobutylene-isoprene rubber (IIR) in sealant compositions. Mixing was conducted in a Z-Blade Mixer. Adhesive, rheological and mechanical properties were determined by std. methods. A surprising raise in adhesive properties caused by rubber reclaim was observed.

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