Curing characterist ics of the different organoclay/CB loaded E-
SBR based nanocompo sites are depicted in the Table 2. The cure
time (t90) and scorch time were reduced in the different organoclay
loaded composites than the neat elastomer. These results can be
attributed to the good interactions and interfacial adhesion be-
tween the nanofillers and the rubber matrix in the presence of
CB. Maximum torque and minimum torque value can be assumed
as a measure of the stock modulus and viscosity of the nanocom-
posites respectively [15]. The torque difference can be compare d
with the degree of crosslinki ng [36]. Different clay loaded rubber
compound s in the presence of CB show increase in the maximum
torque value as well as in the torque difference. The hasty curing
reaction in the E-SBR based nanocompo sites was activated by the
large surface area of the organoclays. Cloisite 30B filled rubber
composite shows maximum improvement in the curing character-
istics than the other two organoclay filled rubber composites. As
Cloisite 30B contains hydroxyl (OH) groups, so the interactions be-
tween it and carboxylate d styrene butadiene rubber were more
pronounced than the other two organoclays . As a result of better
interactio n and interfacial adhesion between Cloisite 30B and E-
SBR, Cloisite 30B filled rubber nanocomposite shows superior cur-
ing features among the different nanocomposites