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The thermal conductivity κ of epoxy resin, MY750, cured with the stoichiometric quantity and twice that quantity of ethylene diamine, has been measured in the range 2-110 K. Both specimens show a plateau in κ in the liquid-helium region, and at higher temperatures κ has an additional term which is proportional to the temperature. This is in accord with the model of Alexander, Entin-Wohlman, and Orbach [Phys. Rev. B 34, 2726 (1986)] for phonon-assisted fraction hopping above the plateau. The magnitude of this contribution, based on the theory of Jagannathan, Entin-Wohlman, and Orbach are in reasonable agreement with our experimental values.
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Oliveira et al. (1989) studied this question.
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