Abstract
The effect of the addition of different compatibilizers such as bromobutyl rubber (BIIR) and maleic anhydride (MA) on the elastic behavior of natural rubber/butyl rubber (NR/IIR) blend has been studied by carrying out equilibrium stress-strain measurements for these blends. From the stress-strain curves, Young's modulus was found to have a maximum value at around 5 phr of BIIR and two maxima were observed at 2 and 12.5 phr of maleic anhydride. The modified Mooney-Rivlin equation was used to calculate the parameters C
1
and C
2
. The Song et al. model was tested here to fit the stress-strain curves at both small and large strain, which is capable of accurately describing the mechanical behavior of these blends.