From this study, the following conclusions can be drawn.
1. Overall, the scorch time (tS2), cure time (t90), tensile
strength and elongation at break (Eb) decreased with
chitosan loading, whereas the maximum torque (MH)
and the tensile modulus (M100 and M300) increased for
all three types of rubber compound.
2. At a similar chitosan loading, the characteristic cure
values of SBR were found to be longer (for tS2 and t90) and
higher (for MH) than those of STR 5L and ENR-25. The
tensile properties of SBR at a similar chitosan loading
were found to be the lowest of the three materials.
3. The rubber-filler interactions for all three types of rubber
decreased with increasing chitosan loading.
4. Morphological studies of the tensile fractured surfaces of
the vulcanisates indicated that chitosan interacts less
well with SBR than with STR 5L and ENR-25