This study predicted the absolute values of the heat capacities from the molecular formula per monomer for a main-chain-type polymer below the Tg. The calculations combined the Tarasov equation, the Einstein equation, and the (Cp − CV) correction term, accounting for the degrees of freedom of the monomer unit. The difference of predicted and experimental heat capacities of poly(4-methyl-1-pentene) was within 8.0% from 90 to 180 K and within ±2.0% agreement from 180 to 300 K. For poly(vinyl benzoate), the values were within ±2.0% from 190 to 350 K, and for poly(1,4-butylene adipate), they were within ±2.0% from 80 to 200 K. The predicted heat capacity was accurate, especially in the high-temperature region above 180 K.
- Marika Yokota
- Itaru Tsukushi