Thermodynamic Properties of Polyvinylidene Chloride

摘要

Using published specific heat data, the entropy, enthalpy and Gibbs free energy of polyvinylidene chloride (PVdC) have been calculated over the temperature range 0 to 200K. Using previously published data on the thermodynamic functions of vinylidene chloride, the entropy of polymerization at 200 K was found to be 21.17 cal/mole deg and the free energy of polymerization was -10.1 kcal/mole. The thermodynamic function Cp/T versus T for PVdC is approximately linear with zero slope over the temperature range 0 to 200K. The thermal motions of PVdC at low temperatures have been studied using the model of Stockmayer and Hecht. By means of this model the maximum frequency of vibration was found to be about 459/cm and the average molecular weight of the repeating unit to be 36.3 gms/mole. (Author)