Influence of Sulfur on Cure Kinetics of Natural Rubber/Sulfur/N-t-butylbenzothiazole-2-sulfenamide (TBBS) System Studied by Rubber Processing Analyzer |
| |
| Authors: | Fei Zhao Xinyan Shi Ping Zhang |
| |
| Institution: | Key Laboratory of Rubber-Plastics, Ministry of Education , Qingdao University of Science and Technology , Qingdao, China |
| |
| Abstract: | Based on the cure characteristics of the Natural Rubber/Sulfur/N–t–butylbenzothiazole– 2–sulfenamide (NR/S/TBBS) system, a kinetic model with induction, curing, and overcure periods was chosen to simulate the cure reaction of this system. Cure-curves reflecting the development of torque were recorded as a function of cure time for NR compounds by a rubber processing analyzer. The cure curves were then non-linear fitted. The results show that the simulated curves fit well with the experimental curves. Rate constant K 2 for formation of activated crosslink precursors is much higher than rate constant K 6 for crosslink degradation under the same cure condition. Reaction activation energy E 2 and E 6 calculated from K 2 and K 6 through the Arrhenius equation showed that E 6 is higher than E 2. The increase of sulfur dosage led to the decrease of E 6 and E 2, but E 6 decreased more evidently. |
| |
| Keywords: | cure kinetic non-linear fitting Origin 6 0 reversion sulfur |
|
|
