In the blend, until 168 h, Dres varies only moderately and produces values that are similar to those of NR. The corresponding changes in σln,1, however, suggest distinct chemical changes within the sample volume which are again indicative of the maturation of sulfur bonds as seen in NR. A standout observation here is that the blend ages less in comparison to the numerically measured weighted average of NR and SBR single vulcanizates plotted for reference. By acknowledging the similarity in Dres of NR and the blend up to 168 h, one can infer that the bulk of the SBR phase experiences lesser chemical changes in the blend than when it is a pure vulcanizate.