were increased with the increasing RR content as compared to that
of the pure rubber vulcanizates, respectively. The stress was decreased with the increasing RR content. Especially, the stress strain
of NR–PBR/RR vulcanizates was decreased after 50% elongation
than that of pure rubber vulcanizates.
In all NR–PBR/RR vulcanizates, the moduli at 100% and 200%
elongation were increased with the increasing RR content. The reason for higher 100% and 200% moduli may be due to higher crosslink density of rubber vulcanizates, shown in Fig. 5, arising out of
the gel present in RR, which is also corroborated by crosslinking value data (Table 1 ). As crosslink density increases with the increasing
RR content in the rubber matrix, the chain mobility decreases and
more load is required for 100% and 200% elongation. The increasing
trend of moduli at 100% and 200% elongation may also be explained
were increased with the increasing RR content as compared to thatof the pure rubber vulcanizates, respectively. The stress was decreased with the increasing RR content. Especially, the stress strainof NR–PBR/RR vulcanizates was decreased after 50% elongationthan that of pure rubber vulcanizates.In all NR–PBR/RR vulcanizates, the moduli at 100% and 200%elongation were increased with the increasing RR content. The reason for higher 100% and 200% moduli may be due to higher crosslink density of rubber vulcanizates, shown in Fig. 5, arising out ofthe gel present in RR, which is also corroborated by crosslinking value data (Table 1 ). As crosslink density increases with the increasingRR content in the rubber matrix, the chain mobility decreases andmore load is required for 100% and 200% elongation. The increasingtrend of moduli at 100% and 200% elongation may also be explained
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