The maximum torque (S0
MH), minimum
torque (S0
ML), torque difference (S0
MHML), scorch time (ts2) and cure time (tc90) of
carbon-black-filled NR/EPDM or NR/R-EPDM blends increased with increasing weight ratio
of virgin EPDM or R-EPDM in the blend. SEM micrographs proved that, for low weight
ratios of virgin EPDM or R-EPDM, the blends exhibited high surface roughness and matrix
tearing lines. The blends also showed a reduction in crack path with increasing virgin
EPDM or R-EPDM content over 30 phr. This reduction in crack path could lead to less
resistance to crack propagation and, therefore, low tensile strength.
The maximum torque (S0MH), minimumtorque (S0ML), torque difference (S0MHML), scorch time (ts2) and cure time (tc90) ofcarbon-black-filled NR/EPDM or NR/R-EPDM blends increased with increasing weight ratioof virgin EPDM or R-EPDM in the blend. SEM micrographs proved that, for low weightratios of virgin EPDM or R-EPDM, the blends exhibited high surface roughness and matrixtearing lines. The blends also showed a reduction in crack path with increasing virginEPDM or R-EPDM content over 30 phr. This reduction in crack path could lead to lessresistance to crack propagation and, therefore, low tensile strength.
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