SYNTHETIC ISOPRENE RUBBER

摘要

The reversion type cure kinetic and induction time models were successfully utilized to predict the isothermal andnonisothermal evolution of the state of cure in vulcanization of the unfilled and carbon black (CB)-filled IR compoundsmeasured by APA 2000. The rate constants for the reversion reaction and the formation of the stable and unstablecrosslinks and the parameters of the induction time function with the Arrhenius temperature dependences were deter-mined from the isothermal cure measurements. The equation was proposed to adequately describe the measured depend-ence of the difference between the maximum and minimum torques as a function of isothermal curing temperature. Themeasured induction time as a function of heating rate and step temperature variation was successfully predicted based onparameters of the isothermal induction time model. Isothermal cure modeling at each curing temperature individually orat all the curing temperatures simultaneously showed the excellent agreement with the experimental data for both curingand reversion. More severe reversion in the CB-filled IR in comparison with the unfilled IR was explained by compar-ing their reversion rate constants.