Abstract
Publisher Summary The specific and molar heat capacities and the latent heats of crystallization or fusion are referred to as calorimetric properties. Both groups of properties can be calculated as additive molar quantities. Furthermore, starting from these properties, the molar entropy and enthalpy of polymers can be estimated. This chapter discusses the heat capacity. The specific heat capacity is the heat that must be added per kilogram of a substance to raise the temperature by one degree. The molar heat capacity is the specific heat multiplied by the molar mass (the molar mass of a structural unit in the case of polymers). Specific and molar heat capacity may be defined at constant volume or at constant pressure. The heat added causes a change in the internal energy and in the enthalpy of the substance. The complete course of the specific heat capacity as a function of temperature has been published for a limited number of polymers only. For all the polymers investigated, the curves for the molar heat capacity of solid and liquid may be approximated by straight lines, except for the solid below 150 K.
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