Home – Home – Jornals – Fundamental and applied issues of mining 2020 number 2

The effect of a hybrid filler consisting of the particles of carbon black and carbon nanotubes (CB/CNT) on the relaxation a-transition, as well as polymer glass transition temperature, which is a measure of the segmental mobility of macromolecules and, respectively, theoretical frost resistance of an elastic material was studied. According to the dynamic mechanical analysis data, the inclusion of CB/CNT hybrid particles in the filler leads to broadening of the temperature dependences peaks of the tangent of mechanical loss TanD for all samples towards lower temperatures and a shift in the position of the TanD maximum by the value from 4 to 16 °С compared to control. The data of differential scanning calorimetry indicate the presence of additional low-temperature α-relaxation transitions in modified vulcanizates (-123 ... -118 ° С). The observed relaxation behavior of macromolecules is caused by the appearance of macromolecules in the material of regions with less dense packing and, as a result, by the expansion of their conformational set during segmental movement at low temperatures. This provides the material with increased fatigue life and frost resistance.