Modeling of the heat capacity of polymers with the variable connectivity index

Correlations for the heat capacity at constant pressure of solid and liquid polymers at room temperature were proposed based on the variable connectivity index in this work. The experimental heat capacity data of 81 solid polymers and 79 liquid polymers were used to establish the correlations, and the average absolute deviations of the heat capacity are 4.8% and 3.8%, respectively. The correlations proposed are simple, which can be used to predict the heat capacity of polymers at room temperature as long as the chemical structure of the polymer concerned is known.