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Heat capacities of polymer solids composed of polyesters and poly(oxide)s, evaluated below the glass transition temperature

Polymer Journal volume 52, pages 1103–1111 (2020)Cite this article

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Abstract

We evaluated the absolute values of the heat capacity of polymer solids composed of polyesters and poly(oxide)s below the glass transition temperature. The frequencies of the skeletal and group-vibration modes were calculated by the Tarasov and Einstein equations, respectively. Furthermore, the estimated heat capacity was corrected by the difference between the heat capacities measured at constant pressure and at constant volume. The heat capacity contributing to the skeletal vibration can be expressed by one- and three-dimensional Tarasov equations, and the contribution of the group vibration can be determined by substituting the absorption frequency obtained from infrared absorption measurements for the frequency value in the Einstein equation. In this combination of equations, the absolute value of the heat capacity was obtained with only three fitting parameters. We thus reproduced the measured heat capacities of eight polyester and five poly(oxide) polymer solids with a carbon and oxygen backbone. The reproduced and experimental heat capacities of all samples except polycaprolactone and poly(3,3-bis(chloromethyl)oxetane) agreed within ±2.5%, and the errors for polycaprolactone and poly(3,3-bis(chloromethyl)oxetane) were within ±4.0%.

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Acknowledgements

The authors would like to thank Enago (www.enago.jp) for the English language review.

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  1. Graduate School of Engineering, Chiba Institute of Technology, 2-1-1 Shibazono, Narashino, Chiba, 275-0023, Japan

    Marika Yokota & Itaru Tsukushi

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  1. Marika Yokota
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Correspondence to Itaru Tsukushi.

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Yokota, M., Tsukushi, I. Heat capacities of polymer solids composed of polyesters and poly(oxide)s, evaluated below the glass transition temperature. Polym J 52, 1103–1111 (2020). https://doi.org/10.1038/s41428-020-0364-3

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