shows the highest compression set when compared to that
of C6 and CB14. This is attributed to the poor filler-rubber
interaction or poor filler dispersion when the silica loading
is high. Another possible explanation is the decrease in
crosslink density when silica loading is high. This result
also agrees well with the previous study showing that the
dynamic compression set tends to increase when the silica
loading is more than 30 phr [12].