Styrene–butadiene rubber mixtures with four types of carbon black were studied in this paper. The mechanical properties, including the ability to damp mechanical vibration, were investigated, along with dynamical mechanical analysis (DMA). It has been found that carbon black types N 110 and N 330, having the largest specific surface area and the smallest particle diameter, provide a good stiffening effect. These particles have significant interactions between the rubber, resulting in good reinforcement. On the other hand, the carbon black N 990 type has a lower reinforcing effect and improved vibration damping properties at higher excitation frequencies due to higher dissipation of mechanical energy into heat under dynamic loading. The effect of the number of loading cycles on vibration damping properties of the rubber composites was also investigated in this study. It can be concluded that the abovementioned properties of the investigated rubber composites correspond to physical–mechanical properties of the applied carbon black types.

Detail záznamu - A study of significant factors affecting viscoelastic damping properties of polymer materials - Detail záznamu - Vědecká knihovna UJEP

The aim of this work is study to the influence of common silane coupling agent Bis[3-(triethoxysilyl)propyl] tetrasulfide (TESPT) on dispersibility of highly polar silica particles in non-polar Natural Rubber (NR) based compounds and correlate the results with possible alternative additives from the group of polyethers, Polyethylene Glycol (PEG) and Polypropylene Glycol (PPG). For that purpose, uncured and cured rubber compounds with different dosage of TESPT, PEG and PPG have been prepared and investigated. The Rubber Process Analyzer (RPA) has been used to quantifying the changes in microstructure interaction of uncured rubber compounds. Effect of presence of dispersant additives on mechanical properties has been investigated in cured rubber due to tensile analyses. Finally, the degree of silica particles dispersion in rubber matrix has been monitored by a reflected light microscope DisperGRADER. It has been found, that addition of chosen dispersant additives leads to improve of dispersion of silica particles in rubber matrix resulting in betterment of mechanical properties. It was confirmed that silane coupling agent creates more durable chemical bonds, which affect mechanical properties more than physical hydrogen bonds in case of polyethers. From RPA measurement, it is evident that rubber compounds containing silane exhibit more stable enhance of mechanical properties.