NR/NBR nanocomposites with higher filler loading showed higher rates of relaxation rate due to the presence of more filler–filler interactions. At 70 °C, the viscosity ratio was found to influence the reinforcement, and consequently relaxation rate of the 50/50 NR/NBR nanocomposites.It was found that the rearrangements of the polymer chains are dependent on the blend composition, temperature,filler/polymer interactions etc.