Papers - Archive

Nr 2/2014 - Abstracts

Elastomery nr 2/2014 cover

C. Cruanes, G. Berton, F. Lacroix, S. Méo, N. Ranganathan

Study of the fatigue behaviour of the chloroprene rubber for uniaxial tests with infrared methods

Rubber-like materials are widely used in the industry, aeronautic or automotive. In these applications, fatigue damage must be taken into account, which requires very long and costly experimental campaigns. One of the main goals of the research on this kind of materials is to improve the prediction of fatigue life with shorter and cheaper tests. This paper describes the first part of an ongoing research about the study of the fatigue behavior of dumbbell specimen made of polychloroprene with infrared thermography. It deals with the definition of two new thermal parameters for the fatigue behavior analysis. The first one is the heating rate and is defined in the first 1500 cycles giving a linear relationship with the stabilized temperature of the specimen. The second thermal parameter is the number of cycles until the stabilization of the surface temperature of the sample. Changes in the thermal behavior observed during fatigue tests,at a given load ratio Fmin/Fmax = 0.1, have been correlated with fatigue behavior changes.

Tomasz Gozdek, Dariusz M. Bieliński, Mariusz Siciński, Hieronim Szymanowski, Anna Piątkowska, Klaudia Kwiatos

Vulcanizates containing plasmochemically modified fillers

Dispersion of components in rubber is an important issue in elastomer technology. In many cases low surface energy of fillers increases the agglomeration effect, which is reflected by mechanical properties of vulcanizates. Preliminary studies have proved, that modification of filler surface can successfully improve the degree of their dispersion in rubber matrix. This work proposed to replace "wet" chemical treatment by plasmochemical method. Low-temperature plasma applied allows for effective and efficient modification of the materials. Pollution-free nature of this kind of modification, together with environmental protection issues are important for potential industrial applications.

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

Influence of unsaturated benzophenone photoinitiators on acrylic PSA performance

In the following study, the synthesis and characterization of UV-crosslinkable solvent-based acrylic pressure-sensitive adhesives (PSA) were presented. Different amounts of unsaturated copolymerizable photoinitiators based on substituted benzophenone were incorporated into acrylic PSAs synthesized in ethyl acetate and based on butyl acrylate and acrylic acid. Molecular weight measurements referring to MW - weight average molecular weight, Mn - number average molecular weight and Pd - polydispersity of the synthesized adhesives were conducted. The synthesized photoreactive acrylic PSA were coated on polyester carrier, dried at 110°C in drying canal and subsequently crosslinked under UV lamp emited UV radiation in the area between 200 and 400 nm. The resulted photoreactive UV-crosslinkable acrylic PSA are characterized by good tack, good adhesion and excellent cohesion.

Paweł Michalski, Konrad Kwiatkowski

Application of nanoindentation technique to testing of polyurethane elastomers

The aim of the study was to investigate the possibility of using nanoindentation for determining the fundamental properties of polyurethane elastomers. Polyurethane elastomers have been synthesized in one or two-steps synthesis with a glass reactor. We determined a Young’s modulus and hardness by nanoindentation, and the results correlated with a Shore hardness. Explained the methodology of measurement and comparative analysis of the results.

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