To predict the performance of a
material over long periods of time, stress relaxation studies with both the reinforced systems were done. The
effects of loading, blend composition, filler polarity and temperature on stress relaxation of OMt reinforced
NR/NBR nanocompositeswere carefullymeasured. Based on the stress relaxation measurements, itwas observed
that due to its polarity difference, O1Mt (Mt modifiedwith dimethyl, benzyl, HTmodification provided by Southern
Clay Products) was preferentially located at the NBR phase while O2Mt (Mt modified with mercapto silane
provided by English India Clay) had more affinity with natural rubber in the NR/NBR nanocomposites.