Abstract
The fracture energies, GIc, of an unmodified and a rubber-modified have been ascertained as a function of test temperature and rate. A time-temperature superpositioning technique has been adopted in order to produce a master curve of the fracture energy, GIc versus the reduced rate of test, tf/aT where tf is the time-to-failure and aT is the time-temperature shift factor. The value of shift factor, aT, as a function of test temperature has been determined from time-temperature shifting the yield stress and the modulus data for the materials. The master curve of GIc versus has been tf/aT and the values of the constants employed in the model have been deduced The value of the constants so determined are discussed with respect to the microstructures of the epoxy polymers.

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