The Specific Heat of the Amorphous and Crystalline States of the Monomer DGEBA between 1.4 and 20 K

Abstract

Measurements of the specific heat, C_p, in both the amorphous and the crystalline states, of the monomer of epoxy-resin, diglycidyl ether of bisphenol A, have been made between 1.4 and 20 K. There is a marked difference in the results for the two states. Whilst both sets of data show a maximum in the plot of C_p/T³ versus T, the maximum for the amorphous material is at 4.5 K whereas it is at 6.5 K for the crystalline sample. These results are in good agreement with the predicted behaviour of the specific heat for this material in the two states as deduced from inelastic neutron scattering measurements by Dianoux, Page and Rosenberg (Phys. Rev. Letters 58, 886 (1987)).