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Correlation of Dynamic Properties of Vulcanizates with Their State of Cure

The state of cure of rubber vulcanizates can be determined by various ways, the most used being the measure of a property such as viscosity. A new way has been explored with the state of cure obtained from the calorimeter measurements by considering the extent of the heat evolved from the cure reaction. Numerical models already described, taking into account the heat transferred by conduction and the heat of the reaction, are able to give information on the value of the state of cure of the vulcanizates. The values of the state of cure obtained by this method have been correlated to some mechanical properties of high interest for the final materials such as their dynamic properties with the in-phase modulus and the loss factor. Linear relationships have been observed between the in-phase modulus and the state of cure for various displacements and for various frequencies.