Irradiation cured samples exhibited better heat stability than the sulfur cured samples and with increase in crosslink density, thermal stability of NR/SBR blend cured by irradiation increases. With increase in irradiation, swelling of sample
decreases. This was explained on the basis of an increase in crosslinking and decrease in free volume of the blend cured by
higher dose.The differences in the swelling behavior of the blends, crosslinked by different systems,were described in terms
of the nature of the crosslinks introduced between the macro-molecular chains during vulcanization.