Estimation of the thermodynamic properties of polymers at different temperatures via additive methods

Conditions for increasing the accuracy and reliability of calculation of the thermodynamic properties of polymers by additive methods have been formulated; they are necessary for determining the parameters of additive methods using the experimental values of polymer properties for each component of the polymer physical modification separately with the subsequent determination of properties of real polymers according to their degree of crystallinity. An additive technique has been developed, and sets of numerical values of additive parameters have been derived for practical calculations of the values of the enthalpies of formation, the absolute entropies, and the isobaric heat capacities of a number of polymers in the range 100–600 K with an accuracy comparable to that of the experimental data.