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Influence of Sulfur on Cure Kinetics of Natural Rubber/Sulfur/N-t-butylbenzothiazole-2-sulfenamide (TBBS) System Studied by Rubber Processing Analyzer

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  • Key Words:cure kinetic; non-linear fitting; Origin 6.0; reversion; sulfur

  • 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 over-cure 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 that? 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.

  • Volume:48

  • Issue:4

  • Translation or Not:no

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