Influence of the measuring conditions on the rheological properties over the ``bounded`` rubber concentration in rubber compounds
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2013-05-22
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Abstract
The purpose of present work is to investigate the influence of measuring conditions on the rheological properties of filled rubber compounds in presence of different amountsof stearic acid over the ``bounded`` rubber concentration. The measurements were performed at different revolutions per minute of Brabender Plasticorder rotors in the mixing camera, respectively 0, 3, 10, 20 and 30 min-1. After the measurements the concentration of ``bounded`` rubber was determined.The obtained dependencies (concentration of ``bounded`` rubberat different rotor revolutions) are quite complex and is affected both by the amount of stearic acid and the revolutions of rotors in the mixing camera during the torque measurements. This diverse change of the concentrations of ``bounded`` rubber in the compounds after the measurement explains smaller variations in torque maximum compared with the effective viscosity. These results are due to the fact that in the camera a further intensive homogenization of the compound ingredients is carried out as well as further dispersion of carbon black in it. Such processes cannot be observed in capillary viscometer.