Electrical resistivity changes during the cure of epoxy resins are interpreted using a model of `hopping' conductivity. If the energy barrier against ionic movement between neighbouring hopping sites increases proportionally to the degree of cross-linking of the resin, then it is justifiable to use the rate of change of the logarithm of resistivity with time as a measure of the reaction rate. The limitations of the method are discussed in the light of the behaviour of real materials.
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Fava et al. (1968) studied this question.
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