Amorphous vibrational specific heat

The Cp s curve of the reheated (control) sample is unaffected by thermal changes and consists of configurational contributions as well as those arising from purely thermal vibrations. Therefore, the vibrational specific heat, Cp,v, for the amorphous alloy is extrapolated from the Cp values in the low-temperature region and is a linear function of temperature, viz.,... 

The polymer characterized in this figure was quenched so that it was completely amorphous and glassy at the low-temperature start of the experiment. As the temperature is raised, the specific heat increases because of the more pronounced vibrations of the atoms in the polymer chains. (In atomic and molecular terms, the specific heat is a measure of the number of modes a system has for taking up energy, and the efficiency with which this energy can be absorbed.)... 

Polyterephthalates. The molecular motion and their connection to the thermal parameters for the three most common members of the homologous series of polyterephthalates is summarized in Fig. 6.40. The number of vibrations and the derived 0-temperatures allows the calculation of a vibrational heat capacity of the solid state, as outlined in Sect. 2.3.7. The changes within the 0-temperatures are practically within the error hmit. The specific heat capacities of the polyterephthalates are, as a result, also almost the same. The transition parameters are extrapolated to the equilibrium crystals and the fuUy amorphous glasses. Their values show regular changes with chemical stracture. All thermal properties are next related to the vibrational baselines computed from the parameters of Fig. 6.40. 

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