Abstract
The rheometric properties of natural rubber compounds containing the compound tetrabutylammonium bis(N‐phenylsulfonyldithiocarbimate)zincate(II) as the accelerator are modulated by means of the response surface methodology (RSM), where the Face Centred Central Composite Design (FCCD) with three factors and three levels was chosen with the objective to obtain the relationship among the evaluated properties and factor levels. The factors in the experimental design are the amounts of both accelerator and sulfur and the vulcanization temperature. The compounds are evaluated as for the scorch time, optimum vulcanization time, and maximum torque. For each of these properties the Regression analysis, the pareto diagram and the fitted surface are obtained. Concerning the scorch and optimum vulcanization times, the most important factors are the vulcanization temperature and the amount of accelerator, respectively. Regarding the maximum torque, the most significant factors are the amounts of sulfur and accelerator. Considering the optimum vulcanization time a regression model with good accuracy could be obtained. The function desirability is used to obtain an optimum condition for an adequate cure system related to a set of desired intervals for the properties of interest.
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