TAF PUBLISHING

The article analyzes relaxation α-transition in elastomeric composites containing a hybrid carbon black/carbon nanotubes (CB/CNT) filler. According to the DMA data, the inclusion of hybrid particles CB/CNT in the filler leads to the expansion of the temperature dependences of the loss tangent (TanD) for all samples towards lower temperatures and the displacement of the position of the TanD maximum by a value from 4.0 up to 16 degrees in comparison with control vulcanizate. The DSC data indicate the presence of additional low-temperature α-relaxation transitions in modified vulcanizates (-123 ... -118 oC). The observed relaxation behavior of macromolecules is due to the appearance in the material of regions with less dense packing of macromolecules and, as a consequence, the expansion of their conformational set for segmental motion under low-temperature conditions. It guarantees to get material with increased fatigue resistance and frost resistance. It is shown that hybrid filler particles, in comparison with carbon black, change the final structure of vulcanizates, causing the appearance of areas with a more loose packing of macromolecules and increased segmental mobility in the low-temperature area. It gives opportunities for getting rubber with increased fatigue resistance and frost resistance.