Four of the runners in the men's 200 have posted a set of scorching times over the past two years, rejuvenating an event that had grown dull since Michael Johnson retired in 2001.
The cure characteristics such as optimum cure time, rheometric scorch time and induction time, are found to decrease with increasing concentration of latex waste filler.
The cure characteristics of SBR vulcanizates are explained in terms of maximum rheometric torque (R∞), optimum cure time (t90), scorch time (t2) and cure rate index (CRI).
The cure characteristics such as scorch time (t 2), cure time (t 90), ML and delta torque of various important samples are given in Table 4.
Cure characteristics, namely, minimum (Ml) and maximum torque (Mh), scorch time (ts2), the optimum cure time (tc90) and the cure rate index (CRI) have been investigated.
The data for maximum rheometric torque (R∞ = Maximum torque−Minimum torque), scorch time (t2), and optimum cure time (t90) of gum vulcanizates are presented in Table 3 where as the data for filled vulcanizates are provided in Table 4.
The rheological properties, such as the start of vulcanization scorch time (TS2), optimum curing time (TC90), cure rate index (CRI), minimum torque (ML), and maximum torque (MH) for different samples are shown in Table 2.
Table 2 presents the cure properties; scorch time (ts2), optimum cure time (t90), minimum and maximum torque (ML,& MH) and change in torque (∆M = M H − M L )) of NBR and EPDM systems.
It is found from the results that the scorch time (t2) and the optimum cure time (t90) for the EPTD-MBTS and PPTD-MBTS systems are somewhat higher than the corresponding values obtained in TMTD-MBTS system (Table 3).
There was a remarkable decrease in the optimum cure time (tc90) and the scorch time (ts2), which was associated with an increase in the cure rate index (CRI), with filler loading up to 30 phr in the different blend ratios.
